# Topic Questions: 3.4 Sum and product laws. — WST01 Probability

> 118 WST01 Probability topic questions (324 marks) on 3.4 Sum and product laws. — 35 papers, 2014–2026. Open the exact question in the original paper.

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Edexcel IAL · Mathematics · WST01 · Probability

118 WST01 Probability topic questions are tagged to this syllabus point across 35 papers (2014–2026). Only the parts whose knowledge graph matches this syllabus statement are counted, and the table shows which parts of each question are involved.

- 118 topic questions
- 35 papers
- 324 tagged marks
- 40.5% of topic questions
- 43.3% of topic marks
- 2014–2026
- Syllabus 2014–current
- [All WST01 Probability topic questions](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-1-wst01/probability/)
- [All paper codes](https://www.examsci.com/topics/)

Core finding

**This Probability syllabus point appears in 35 WST01 papers across 2014–2026, contributing 118 topic questions and 324 marks.** The most recent appearance is WST01/01 January 2026. That equals 40.5% of the 291 topic questions and 43.3% of the 749 marks tagged to Probability. Only parts tagged to this subtopic are counted, so a four-part question can contribute one item and one part's marks. The table lists every matching question, its tagged parts and marks, with a link back to the paper page. Sessions are newest first, so the statement can be traced back through the full paper history.

## Topic questions by session

Newest sessions first. Parts and marks count only the parts tagged to this subtopic; “x of y parts” shows how much of the question is tagged elsewhere. Select the paper cell to open the matching question on the paper page, or use **Go to Practice Hub** to answer that exact question in the Interactive Practice Hub.

| Paper | Question | Type | Parts | Marks | Difficulty | Practice |
| --- | --- | --- | --- | --- | --- | --- |
| [**WST01/01** January 2026 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2026-january-wst01-01/#q-3) | **Q3** Venn Diagrams and Conditional Probability - Edexcel IAL S1 Jan 2026 Q3 | FRQ | 1 of 5 parts ((b)) | 4 of 9 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=24109888-8a15-4c84-8b20-c8c4906c9e9f&question_id=5ec75d56-8531-4986-9903-4eea5da096b3&source_detail=WST01%2F01+January+2026) |
| [**WST01/01** January 2026 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2026-january-wst01-01/#q-5) | **Q5** Probability Tree Diagrams and Conditional Probability - Edexcel IAL S1 Jan 2026 Q5 | FRQ | 2 of 3 parts ((b), (c)) | 7 of 10 on the paper | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=24109888-8a15-4c84-8b20-c8c4906c9e9f&question_id=9391b55d-8bc2-400b-aa50-76634cc7e7b7&source_detail=WST01%2F01+January+2026) |
| [**WST01/02** January 2026 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2026-january-wst01-02/#q-4) | **Q4** Probability - Jan 2026 Q4 | FRQ | 3 of 5 parts ((b), (c), (e)) | 8 of 11 on the paper | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=1f357306-d07a-49ec-842d-c971dee0e0cd&question_id=6e371cf7-bd86-453f-9515-41171d3e10a1&source_detail=WST01%2F02+January+2026) |
| [**WST01/02** January 2026 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2026-january-wst01-02/#q-7) | **Q7** Venn Diagrams and Probability Laws - Jan 2026 Q7 | FRQ | 1 of 4 parts ((a)) | 3 of 12 on the paper | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=1f357306-d07a-49ec-842d-c971dee0e0cd&question_id=ecf6ce87-e36a-4af4-8da6-9aa6153aee5b&source_detail=WST01%2F02+January+2026) |
| [**WST01/01** October 2025 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2025-october-wst01-01/#q-8) | **Q8** Paul's Work Travel Probabilities and Tree Diagram | FRQ | 2 of 3 parts ((a), (c)) | 5 of 7 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=25b5937a-ecc4-4683-af4d-df8053d3ef1d&question_id=d45ff283-6451-4fae-abea-b4c830ba9786&source_detail=WST01%2F01+October+2025) |
| [**WST01/02** October 2025 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2025-october-wst01-02/#q-2) | **Q2** Discrete Probability Distributions - Edexcel IAL S1 October 2025 Q2 | FRQ | 1 of 5 parts ((d)) | 2 of 10 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=e7a37483-4ba0-4b94-8523-01cb41b4f829&question_id=244cedfd-e4d1-4b21-b145-c7296b761f70&source_detail=WST01%2F02+October+2025) |
| [**WST01/02** October 2025 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2025-october-wst01-02/#q-4) | **Q4** The Normal Distribution - Edexcel IAL S1 October 2025 Q4 | FRQ | 1 of 4 parts ((d)) | 3 of 11 on the paper | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=e7a37483-4ba0-4b94-8523-01cb41b4f829&question_id=c66794f0-62f4-4677-aba5-81fbfa85cbcf&source_detail=WST01%2F02+October+2025) |
| [**WST01/02** October 2025 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2025-october-wst01-02/#q-5) | **Q5** Probability and Venn/Tree Diagrams - Edexcel IAL S1 October 2025 Q5 | FRQ | 4 parts ((a), (b), (c), (d)) | 9 | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=e7a37483-4ba0-4b94-8523-01cb41b4f829&question_id=3b953104-041a-423f-ab81-243984dd055f&source_detail=WST01%2F02+October+2025) |
| [**WST01/01** June 2025 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2025-june-wst01-01/#q-4) | **Q4** Basic Probability Laws - Edexcel IAL June 2025 S1 Q4 | FRQ | 2 parts ((a), (b)) | 4 | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=eaaae1ba-24f5-41af-a961-a10e48255aea&question_id=c5814436-212e-486f-afa3-c828c81f61cd&source_detail=WST01%2F01+June+2025) |
| [**WST01/01** June 2025 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2025-june-wst01-01/#q-6) | **Q6** Normal Distribution and Percentiles - Edexcel IAL June 2025 S1 Q6 | FRQ | 1 of 4 parts ((b)) | 3 of 14 on the paper | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=eaaae1ba-24f5-41af-a961-a10e48255aea&question_id=4ddad791-5037-465b-8091-d110365ae827&source_detail=WST01%2F01+June+2025) |
| [**WST01/01** June 2025 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2025-june-wst01-01/#q-7) | **Q7** Tree Diagrams and Conditional Probability - Edexcel IAL June 2025 S1 Q7 | FRQ | 4 of 5 parts ((b), (c), (d), (e)) | 10 of 13 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=eaaae1ba-24f5-41af-a961-a10e48255aea&question_id=0ee1584a-b9b0-4502-a80a-869542c2acc5&source_detail=WST01%2F01+June+2025) |
| [**WST01/01** January 2025 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2025-january-wst01-01/#q-1) | **Q1** Discrete Random Variables and Distributions - Edexcel IAL S1 Jan 2025 Q1 | FRQ | 2 of 8 parts ((e), (f)) | 5 of 15 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=7c231f6c-f773-49d3-90ff-374502de2488&question_id=e968aaeb-5eea-4b13-9942-2b808a390e2e&source_detail=WST01%2F01+January+2025) |
| [**WST01/01** January 2025 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2025-january-wst01-01/#q-3) | **Q3** Tree Diagrams and Conditional Probability - Edexcel IAL S1 Jan 2025 Q3 | FRQ | 2 of 3 parts ((a), (b)(i)) | 4 of 6 on the paper | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=7c231f6c-f773-49d3-90ff-374502de2488&question_id=32d11dd3-da42-4c84-85f1-b8b9602eb7b2&source_detail=WST01%2F01+January+2025) |
| [**WST01/01** October 2024 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2024-october-wst01-01/#q-6) | **Q6** Discrete Random Variables and Biased Dice - Edexcel IAL S1 Oct 2024 Q6 | FRQ | 1 of 6 parts ((f)) | 2 of 14 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=05dfad24-ee91-470d-bedb-93d7a93723b5&question_id=f1100ac8-69e9-422e-93b6-912ac52efc71&source_detail=WST01%2F01+October+2024) |
| [**WST01/01** October 2024 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2024-october-wst01-01/#q-7) | **Q7** Tree Diagrams and Conditional Probability - Edexcel IAL S1 Oct 2024 Q7 | FRQ | 3 of 4 parts ((a), (b), (d)) | 7 of 9 on the paper | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=05dfad24-ee91-470d-bedb-93d7a93723b5&question_id=84e8a491-c441-490c-b056-b4b464912031&source_detail=WST01%2F01+October+2024) |
| [**WST01/01** June 2024 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2024-june-wst01-01/#q-2) | **Q2** Discrete Random Variables - Edexcel IAL Statistics S1 June 2024 Q2 | FRQ | 1 of 4 parts ((d)) | 4 of 12 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=ba43818b-3c06-484a-8b01-c383055544be&question_id=932daf18-aa20-4918-8ba8-093dee17958d&source_detail=WST01%2F01+June+2024) |
| [**WST01/01** June 2024 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2024-june-wst01-01/#q-6) | **Q6** Probability and Venn Diagrams - Edexcel IAL Statistics S1 June 2024 Q6 | FRQ | 1 of 5 parts ((b)) | 4 of 13 on the paper | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=ba43818b-3c06-484a-8b01-c383055544be&question_id=629bbdfa-29f1-483e-94d0-9e865246868f&source_detail=WST01%2F01+June+2024) |
| [**WST01/01** January 2024 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2024-january-wst01-01/#q-1) | **Q1** Heights of Plants Histogram - Edexcel IAL S1 Jan 2024 Q1 | FRQ | 1 of 4 parts ((d)) | 3 of 8 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=bd6d9976-7db6-4123-bb8d-dc26f9a639ae&question_id=b0f8ea52-8af0-4d0b-a415-b154fa913c29&source_detail=WST01%2F01+January+2024) |
| [**WST01/01** January 2024 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2024-january-wst01-01/#q-3) | **Q3** Sixth Form College Handedness - Edexcel IAL S1 Jan 2024 Q3 | FRQ | 2 of 4 parts ((b), (c)) | 5 of 8 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=bd6d9976-7db6-4123-bb8d-dc26f9a639ae&question_id=37fb89fd-bf91-473e-831c-14a9b6595239&source_detail=WST01%2F01+January+2024) |
| [**WST01/01** January 2024 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2024-january-wst01-01/#q-5) | **Q5** Discus Throws Normal Distribution - Edexcel IAL S1 Jan 2024 Q5 | FRQ | 1 of 2 parts ((b)) | 5 of 7 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=bd6d9976-7db6-4123-bb8d-dc26f9a639ae&question_id=0941f4e0-6cde-4d6f-bf1b-2c049cd0ac7e&source_detail=WST01%2F01+January+2024) |
| [**WST01/01** January 2024 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2024-january-wst01-01/#q-6) | **Q6** Probability Events and Equations - Edexcel IAL S1 Jan 2024 Q6 | FRQ | 1 of 3 parts ((a)) | 3 of 9 on the paper | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=bd6d9976-7db6-4123-bb8d-dc26f9a639ae&question_id=6c17a6b5-f565-4d71-ba8d-ca53d5ee662b&source_detail=WST01%2F01+January+2024) |
| [**WST01/01** October 2023 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2023-october-wst01-01/#q-1) | **Q1** Probability Tree Diagrams and Conditional Probability - Edexcel IAL Statistics S1 Oct 2023 Q1 | FRQ | 2 of 5 parts ((b), (c)) | 4 of 11 on the paper | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=64e87e3b-3797-4577-a7b5-9a5f0d3c7412&question_id=3f0428d3-78a4-4f7b-aa11-6e9f7dc92f6b&source_detail=WST01%2F01+October+2023) |
| [**WST01/01** October 2023 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2023-october-wst01-01/#q-3) | **Q3** Venn Diagrams and Probability Laws - Edexcel IAL Statistics S1 Oct 2023 Q3 | FRQ | 2 of 6 parts ((ii)(a), (ii)(b)) | 4 of 12 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=64e87e3b-3797-4577-a7b5-9a5f0d3c7412&question_id=2bb2b51b-ef3f-4e72-ada9-c02c8c5e1ba2&source_detail=WST01%2F01+October+2023) |
| [**WST01/01** June 2023 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2023-june-wst01-01/#q-4) | **Q4** Probability Tree Diagrams and Conditional Probability - Edexcel IAL S1 Jun 2023 Q4 | FRQ | 2 of 4 parts ((b), (c)) | 4 of 9 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=10c8a3bf-4c2c-43fa-81ce-07dc4d4f7e3f&question_id=7729c25c-cb0b-481f-b18a-af3e1426a573&source_detail=WST01%2F01+June+2023) |
| [**WST01/01** June 2023 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2023-june-wst01-01/#q-6) | **Q6** Venn Diagrams and Probability Laws - Edexcel IAL S1 Jun 2023 Q6 | FRQ | 2 of 3 parts ((a), (b)) | 4 of 9 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=10c8a3bf-4c2c-43fa-81ce-07dc4d4f7e3f&question_id=27a8da56-c747-431d-abf1-f1f2f776d189&source_detail=WST01%2F01+June+2023) |
| [**WST01/01** June 2023 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2023-june-wst01-01/#q-7) | **Q7** Normal Distribution Calculations - Edexcel IAL S1 Jun 2023 Q7 | FRQ | 1 of 4 parts ((b)) | 2 of 14 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=10c8a3bf-4c2c-43fa-81ce-07dc4d4f7e3f&question_id=bfbfab38-3cde-44b9-a172-60dc846247e1&source_detail=WST01%2F01+June+2023) |
| [**WST01/01** January 2023 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2023-january-wst01-01/#q-2) | **Q2** Probability Tree Diagram and Conditional Probability - Edexcel IAL S1 January 2023 Q2 | FRQ | 2 of 4 parts ((b), (c)) | 4 of 10 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=e737c446-6240-468d-9e31-1cba09717d09&question_id=272cfa0d-bf51-40f2-91ff-ef8787bdf94e&source_detail=WST01%2F01+January+2023) |
| [**WST01/01** October 2022 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2022-october-wst01-01/#q-6) | **Q6** Venn Diagram Probability Analysis - Edexcel IAL S1 Oct 2022 Q6 | FRQ | 2 of 3 parts ((b), (c)) | 8 of 11 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=2be0662d-5d5f-4f88-937a-430b5bb831d8&question_id=22d0f727-3267-497c-96e6-5c4a50113010&source_detail=WST01%2F01+October+2022) |
| [**WST01/01** October 2022 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2022-october-wst01-01/#q-7) | **Q7** Discrete Probability Distribution and Multi-variable Joint Events - Edexcel IAL S1 Oct 2022 Q7 | FRQ | 2 of 6 parts ((e), (f)) | 7 of 14 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=2be0662d-5d5f-4f88-937a-430b5bb831d8&question_id=f10f2651-db75-4821-bd79-4cf7077ca4d2&source_detail=WST01%2F01+October+2022) |
| [**WST01/01** June 2022 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2022-june-wst01-01/#q-3) | **Q3** Representation of Data - Histogram, Linear Interpolation, Probability, and Coding | FRQ | 1 of 6 parts ((d)) | 2 of 14 on the paper | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=98e5a69c-d09d-42bb-abc2-4fb56ab2814a&question_id=c898e3f8-74e9-4c78-b144-7a5511f0f4ea&source_detail=WST01%2F01+June+2022) |
| [**WST01/01** June 2022 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2022-june-wst01-01/#q-4) | **Q4** Probability - Independence, Conditional Probability, and Venn Diagrams | FRQ | 1 of 3 parts ((a)) | 4 of 11 on the paper | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=98e5a69c-d09d-42bb-abc2-4fb56ab2814a&question_id=7bc2a0d2-3f76-49b5-b1f3-4bd8f8661c4b&source_detail=WST01%2F01+June+2022) |
| [**WST01/01** June 2022 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2022-june-wst01-01/#q-5) | **Q5** Discrete Random Variables - Expected Values, Probability Distributions, and Game Probability | FRQ | 2 of 6 parts ((e), (f)) | 5 of 14 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=98e5a69c-d09d-42bb-abc2-4fb56ab2814a&question_id=1f717d65-ee08-412d-bd6f-02bd8de4327a&source_detail=WST01%2F01+June+2022) |
| [**WST01/01** January 2022 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2022-january-wst01-01/#q-5) | **Q5** Normal Distribution and Probability - Edexcel IAL S1 Jan 2022 Q5 | FRQ | 1 of 3 parts ((c)) | 4 of 11 on the paper | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=7de5bf95-3af8-43f6-ab08-d335d399d3b1&question_id=a8f15f43-d0ba-4816-a422-d1ccddf5e91d&source_detail=WST01%2F01+January+2022) |
| [**WST01/01** January 2022 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2022-january-wst01-01/#q-7) | **Q7** Hypergeometric Probability and CDF - Edexcel IAL S1 Jan 2022 Q7 | FRQ | 2 of 3 parts ((a), (c)) | 10 of 11 on the paper | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=7de5bf95-3af8-43f6-ab08-d335d399d3b1&question_id=b143cb7e-c459-41c6-9592-2710d1415362&source_detail=WST01%2F01+January+2022) |
| [**WST01/01** October 2021 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2021-october-wst01-01/#q-4) | **Q4** Probability Tree Diagram and Discrete Random Variables - Edexcel IAL S1 Oct 2021 Q4 | FRQ | 2 of 5 parts ((a), (b)) | 6 of 13 on the paper | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=8afe31c0-83e4-44f0-a07a-cdf6bd2d8b59&question_id=fca6fb34-d17a-4724-aa95-a41a5c43ac8d&source_detail=WST01%2F01+October+2021) |
| [**WST01/01** June 2021 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2021-june-wst01-01/#q-1) | **Q1** Probability Tree Diagrams - Edexcel IAL S1 Jun 2021 Q1 | FRQ | 1 of 2 parts ((b)) | 3 of 5 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=05f14f9e-5115-4795-956d-48ffb42b7f57&question_id=bdd8065a-8bcc-406f-ae16-6b0eae298cc8&source_detail=WST01%2F01+June+2021) |
| [**WST01/01** June 2021 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2021-june-wst01-01/#q-4) | **Q4** Normal Distribution & Conditional Probability - Edexcel IAL S1 Jun 2021 Q4 | FRQ | 1 of 4 parts ((d)) | 3 of 13 on the paper | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=05f14f9e-5115-4795-956d-48ffb42b7f57&question_id=dcbc5540-2e16-4a9e-a37b-1867df7b615c&source_detail=WST01%2F01+June+2021) |
| [**WST01/01** January 2021 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2021-january-wst01-01/#q-3) | **Q3** Normal Distribution Calculations - Edexcel IAL S1 Jan 2021 Q3 | FRQ | 1 of 4 parts ((d)) | 3 of 13 on the paper | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=47377eb9-33d0-48b6-bf89-6bfd7f53bfef&question_id=1bb8be79-49c3-4f0e-8ab5-e021d8faa077&source_detail=WST01%2F01+January+2021) |
| [**WST01/01** October 2020 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2020-october-wst01-01/#q-2) | **Q2** Probability Tree Diagram and Independence - Edexcel IAL S1 Oct 2020 Q2 | FRQ | 2 of 5 parts ((a), (b)) | 3 of 13 on the paper | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=d767123a-c14c-4339-8451-efe3392dc3f6&question_id=cd96b312-6a16-43fb-b491-f11ed5f3d144&source_detail=WST01%2F01+October+2020) |
| [**WST01/01** October 2020 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2020-october-wst01-01/#q-6) | **Q6** Discrete and Normal Distributions - Edexcel IAL S1 Oct 2020 Q6 | FRQ | 1 of 7 parts ((g)) | 2 of 15 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=d767123a-c14c-4339-8451-efe3392dc3f6&question_id=c0907c8e-2839-4e3b-a88d-10eed0844f45&source_detail=WST01%2F01+October+2020) |
| [**WST01/01** January 2020 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2020-january-wst01-01/#q-6) | **Q6** Discrete Random Variables and Expected Profit | FRQ | 2 of 6 parts ((d), (e)) | 5 of 17 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=060e1276-04a8-4c55-9feb-db156686577a&question_id=14ad93a6-140b-4e56-bc66-f6a130662f14&source_detail=WST01%2F01+January+2020) |
| [**WST01/01** October 2019 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2019-october-wst01-01/#q-3) | **Q3** The Normal Distribution - Edexcel IAL Statistics S1 Oct 2019 Q3 | FRQ | 1 of 2 parts ((b)) | 5 of 8 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=16c43531-bb62-4052-82d4-4c39368745df&question_id=cb3f332c-3f1f-4769-a461-3eea642f1eed&source_detail=WST01%2F01+October+2019) |
| [**WST01/01** June 2019 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2019-june-wst01-01/#q-3) | **Q3** Disease Diagnosis Tree Diagram - Edexcel IAL S1 Jun 2019 Q3 | FRQ | 1 of 4 parts ((b)) | 7 of 13 on the paper | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=63157e68-d0d9-4b7d-a8fe-e9f4fd1f89fa&question_id=60a20906-5d37-4edd-adfb-9d8c225e1c7f&source_detail=WST01%2F01+June+2019) |
| [**WST01/01** June 2019 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2019-june-wst01-01/#q-4) | **Q4** Weights of Packages Normal Distribution - Edexcel IAL S1 Jun 2019 Q4 | FRQ | 1 of 4 parts ((d)) | 3 of 13 on the paper | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=63157e68-d0d9-4b7d-a8fe-e9f4fd1f89fa&question_id=42407a2d-8b63-4bbd-a7dc-14265ae48cc6&source_detail=WST01%2F01+June+2019) |
| [**WST01/01** June 2019 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2019-june-wst01-01/#q-5) | **Q5** Biased Spinner Discrete Random Variable - Edexcel IAL S1 Jun 2019 Q5 | FRQ | 1 of 5 parts ((d)) | 4 of 14 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=63157e68-d0d9-4b7d-a8fe-e9f4fd1f89fa&question_id=f106fd07-f5eb-473e-81d3-53558b522954&source_detail=WST01%2F01+June+2019) |
| [**WST01/01** January 2019 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2019-january-wst01-01/#q-1) | **Q1** Venn Diagram and Probability - Edexcel IAL S1 Jan 2019 Q1 | FRQ | 2 of 4 parts ((b), (d)) | 5 of 9 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=9835256d-c8ce-4694-88d4-4966e00f9af1&question_id=d30b45c5-25af-42a4-bb25-58ca6e436316&source_detail=WST01%2F01+January+2019) |
| [**WST01/01** January 2019 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2019-january-wst01-01/#q-5) | **Q5** Probability Modelling and Evaluation - Edexcel IAL S1 Jan 2019 Q5 | FRQ | 2 of 6 parts ((b), (d)) | 7 of 15 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=9835256d-c8ce-4694-88d4-4966e00f9af1&question_id=8aa160eb-b1f6-49d9-92f0-0be34f6ce7bd&source_detail=WST01%2F01+January+2019) |
| [**WST01/01** October 2018 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2018-october-wst01-01/#q-4) | **Q4** Venn Diagrams and Probability Laws - Edexcel IAL S1 Oct 2018 Q4 | FRQ | 1 of 4 parts ((d)) | 3 of 10 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=bccf8334-d3a5-4f52-a293-2b8bddeed272&question_id=aa6c5f72-6f63-40e3-9992-b320a03db574&source_detail=WST01%2F01+October+2018) |
| [**WST01/01** June 2018 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2018-june-wst01-01/#q-3) | **Q3** Probability and Tree Diagrams - Edexcel IAL S1 June 2018 Q3 | FRQ | 3 of 4 parts ((a), (b), (c)) | 5 of 7 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=4623222d-7332-4dbd-9d37-2435c34c54b8&question_id=d92a3dd8-f137-4edd-8ded-6f59766301b6&source_detail=WST01%2F01+June+2018) |
| [**WST01/01** June 2018 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2018-june-wst01-01/#q-7) | **Q7** Probability Laws and Venn Diagrams - Edexcel IAL S1 June 2018 Q7 | FRQ | 1 of 4 parts ((a)) | 3 of 12 on the paper | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=4623222d-7332-4dbd-9d37-2435c34c54b8&question_id=896c55b2-60aa-44c9-806f-fcb2f9f3e8fc&source_detail=WST01%2F01+June+2018) |
| [**WST01/01** January 2018 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2018-january-wst01-01/#q-2) | **Q2** Venn Diagrams and Probability Laws - Edexcel IAL S1 Jan 2018 Q2 | FRQ | 2 of 3 parts ((b), (c)) | 7 of 8 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=e8304cdf-411e-4e4a-9d73-49a2fa428939&question_id=5233c4c3-03ec-4302-ad3c-5d0204144d4d&source_detail=WST01%2F01+January+2018) |
| [**WST01/01** January 2018 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2018-january-wst01-01/#q-6) | **Q6** Probability without Replacement - Edexcel IAL S1 Jan 2018 Q6 | FRQ | 3 of 5 parts ((b), (c), (e)) | 8 of 11 on the paper | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=e8304cdf-411e-4e4a-9d73-49a2fa428939&question_id=ca143490-caec-46f1-a45a-5f78afb88ee1&source_detail=WST01%2F01+January+2018) |
| [**WST01/01** October 2017 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2017-october-wst01-01/#q-2) | **Q2** Venn diagram and probability - Edexcel IAL S1 Oct 2017 Q2 | FRQ | 2 of 6 parts ((c), (e)) | 5 of 11 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=46dbee62-0633-41cd-9df6-71e49b160803&question_id=a763d287-30d1-493e-a2fe-e8244579d236&source_detail=WST01%2F01+October+2017) |
| [**WST01/01** October 2017 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2017-october-wst01-01/#q-4) | **Q4** Tree diagram and probability - Edexcel IAL S1 Oct 2017 Q4 | FRQ | 1 of 2 parts ((a)) | 6 of 8 on the paper | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=46dbee62-0633-41cd-9df6-71e49b160803&question_id=98f8a5c9-9ee8-4ace-8fb3-596a72cec25e&source_detail=WST01%2F01+October+2017) |
| [**WST01/01** October 2017 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2017-october-wst01-01/#q-6) | **Q6** Discrete random variables and expectations - Edexcel IAL S1 Oct 2017 Q6 | FRQ | 1 of 8 parts ((b)) | 2 of 17 on the paper | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=46dbee62-0633-41cd-9df6-71e49b160803&question_id=0934bb81-3d9e-4aaa-93b1-a659994d22ce&source_detail=WST01%2F01+October+2017) |
| [**WST01/01** June 2017 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2017-june-wst01-01/#q-3) | **Q3** The Normal distribution - Edexcel IAL S1 June 2017 Q3 | FRQ | 1 of 4 parts ((d)) | 3 of 12 on the paper | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=5f47d0cd-fbe6-4039-8dd6-f21014d4b490&question_id=c5034706-491b-4c33-8d76-7ed09db4bf72&source_detail=WST01%2F01+June+2017) |
| [**WST01/01** June 2017 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2017-june-wst01-01/#q-4) | **Q4** Tree diagrams and probability - Edexcel IAL S1 June 2017 Q4 | FRQ | 3 of 4 parts ((a), (b), (c)) | 9 of 12 on the paper | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=5f47d0cd-fbe6-4039-8dd6-f21014d4b490&question_id=afc6d5f1-9721-4d53-97f1-74aa952c1334&source_detail=WST01%2F01+June+2017) |
| [**WST01/01** January 2017 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2017-january-wst01-01/#q-1) | **Q1** Representation and Summary of Data - Edexcel IAL S1 Jan 2017 Q1 | FRQ | 1 of 6 parts ((f)) | 4 of 12 on the paper | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=1a9f502e-3d00-4385-8f4c-18d60b758de8&question_id=85885739-972e-4635-9fe3-2bfc8345141a&source_detail=WST01%2F01+January+2017) |
| [**WST01/01** January 2017 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2017-january-wst01-01/#q-4) | **Q4** Discrete Random Variables - Edexcel IAL S1 Jan 2017 Q4 | FRQ | 2 of 6 parts ((e), (f)) | 5 of 13 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=1a9f502e-3d00-4385-8f4c-18d60b758de8&question_id=49c3fd40-4aff-43ca-bc7b-e0a5d233c7fc&source_detail=WST01%2F01+January+2017) |
| [**WST01/01** January 2017 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2017-january-wst01-01/#q-5) | **Q5** Probability and Tree Diagrams - Edexcel IAL S1 Jan 2017 Q5 | FRQ | 1 of 3 parts ((b)) | 2 of 6 on the paper | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=1a9f502e-3d00-4385-8f4c-18d60b758de8&question_id=7a2d35c4-a7b2-4ce9-99a0-bc5100a1cf2e&source_detail=WST01%2F01+January+2017) |
| [**WST01/01** January 2017 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2017-january-wst01-01/#q-6) | **Q6** The Normal Distribution - Edexcel IAL S1 Jan 2017 Q6 | FRQ | 1 of 3 parts ((c)) | 4 of 8 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=1a9f502e-3d00-4385-8f4c-18d60b758de8&question_id=7c893fe2-1873-488d-a846-45f0cd88756d&source_detail=WST01%2F01+January+2017) |
| [**WST01/01** June 2016 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2016-june-wst01-01/#q-5) | **Q5** Biased Tetrahedral Die Game - Edexcel IAL S1 June 2016 Q5 | FRQ | 2 of 3 parts ((a), (b)) | 5 of 8 on the paper | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=b4b356b9-e8c0-47d1-ad81-a1cb08b96a9f&question_id=150d62dc-5ecd-497d-8a04-82da18d355b7&source_detail=WST01%2F01+June+2016) |
| [**WST01/01** June 2016 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2016-june-wst01-01/#q-6) | **Q6** Venn Diagrams and Probability Laws - Edexcel IAL S1 June 2016 Q6 | FRQ | 2 of 4 parts ((a), (b)) | 5 of 11 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=b4b356b9-e8c0-47d1-ad81-a1cb08b96a9f&question_id=feaa7584-2f84-4e26-9d10-0b08ecaf92dc&source_detail=WST01%2F01+June+2016) |
| [**WST01/01** January 2016 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2016-january-wst01-01/#q-2) | **Q2** Representation and Summary of Data - Edexcel IAL S1 Jan 2016 Q2 | FRQ | 1 of 6 parts ((f)) | 3 of 12 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=195df171-04c9-4334-9631-0f01dce861b4&question_id=abd05c67-d046-4b49-88e8-d3d18e33fa95&source_detail=WST01%2F01+January+2016) |
| [**WST01/01** January 2016 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2016-january-wst01-01/#q-4) | **Q4** Probability - Edexcel IAL S1 Jan 2016 Q4 | FRQ | 1 of 5 parts ((b)) | 2 of 13 on the paper | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=195df171-04c9-4334-9631-0f01dce861b4&question_id=f5e0aac1-7ffa-45f7-bb1f-125b6e5fd543&source_detail=WST01%2F01+January+2016) |
| [**WST01/01** June 2015 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2015-june-wst01-01/#q-4) | **Q4** Probability Laws and Sampling - Edexcel IAL S1 June 2015 Q4 | FRQ | 4 parts ((a), (b), (c), (d)) | 9 | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=589427ba-c1ca-4d7f-b977-5339870547b9&question_id=2ea9815f-4c9b-4fa9-9d67-f1a00e950e88&source_detail=WST01%2F01+June+2015) |
| [**WST01/01** January 2015 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2015-january-wst01-01/#q-1) | **Q1** Discrete Random Variables - Edexcel IAL S1 Jan 2015 Q1 | FRQ | 1 of 5 parts ((d)) | 2 of 10 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=675a8bc9-486a-4943-956c-2e59b4607250&question_id=c31727c3-b189-494c-9c70-1f6cbffff54c&source_detail=WST01%2F01+January+2015) |
| [**WST01/01** January 2015 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2015-january-wst01-01/#q-4) | **Q4** Probability & Venn Diagrams - Edexcel IAL S1 Jan 2015 Q4 | FRQ | 1 of 4 parts ((b)) | 1 of 9 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=675a8bc9-486a-4943-956c-2e59b4607250&question_id=a5b1ca16-1bae-4aa1-930e-6c95e1ad2d25&source_detail=WST01%2F01+January+2015) |
| [**WST01/01** June 2014 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2014-june-wst01-01/#q-7) | **Q7** Tennis Ball Throwing Model - Edexcel IAL Statistics S1 June 2014 Q7 | FRQ | 1 of 3 parts ((c)) | 3 of 10 on the paper | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=a4ec1570-2bfb-41e3-ba03-db14c1447091&question_id=89cbe94b-9e2f-4940-adcf-9a7da1e0afac&source_detail=WST01%2F01+June+2014) |
| [**WST01/01** January 2014 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2014-january-wst01-01/#q-5) | **Q5** Venn Diagrams and Probability - Edexcel IAL S1 Jan 2014 Q5 | FRQ | 1 of 6 parts ((e)) | 1 of 10 on the paper | Easy | [Go to Practice Hub](https://www.examsci.com/practice?set_id=6f1ef4b7-f8ed-4c79-b52e-f99a49ff6aa3&question_id=eba3e4ea-8f36-4ab7-b19a-1710929dc221&source_detail=WST01%2F01+January+2014) |
| [**WST01/01** January 2014 · Edexcel IAL](https://www.examsci.com/past-papers/edexcel-ial/mathematics/statistics-1-wst01/2014-january-wst01-01/#q-7) | **Q7** Conditional Probability - Edexcel IAL S1 Jan 2014 Q7 | FRQ | 4 parts ((a), (b), (c), (d)) | 9 | Medium | [Go to Practice Hub](https://www.examsci.com/practice?set_id=6f1ef4b7-f8ed-4c79-b52e-f99a49ff6aa3&question_id=a13982c7-f78a-4ec1-aa0f-766132b4fd51&source_detail=WST01%2F01+January+2014) |

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- [3.2 Sample space. Exclusive and complementary events. Conditional probability.](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-1-wst01/probability/3-2-sample-space-exclusive-and-complementary-events-conditional-probability/) — 196 question items · 36 papers — 531 marks · 2014–2026
- [3.3 Independence of two events.](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-1-wst01/probability/3-3-independence-of-two-events/) — 40 question items · 28 papers — 113 marks · 2014–2026
- [6.1 The Normal distribution including the mean, variance and use of tables of the cumulative distribution function.](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-1-wst01/probability/6-1-the-normal-distribution-including-the-mean-variance-and-use-of-tables-of-the/) — 1 question items · 1 papers — 4 marks · 2023

## Topic question rules and edge cases

**How many topic questions cover this syllabus point?**

71 question stems cover this subtopic across 35 papers, but only 118 tagged parts and 324 marks belong to it. Other parts of the same questions are assessed under different statements and are excluded from this page.

**Which papers include this subtopic?**

The table lists every matching session from 2014–2026. Each row links to the question anchor on the paper page, where the full paper context and practice entry point are available.

**Why can one question appear under several subtopics?**

The parts of one question can assess different syllabus statements. Each part is counted under its own subtopics, so the same question stem can appear on several subtopic pages while each page lists only the parts and marks tagged to that statement.

**Can I practise these questions with AI marking?**

Yes. Open a paper from the table and use the Interactive Practice Hub entry point. The page itself is static HTML so search engines and retrieval agents can read the full question list without executing JavaScript.

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Full page with native tables, bar charts and Practice Hub links: https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-1-wst01/probability/3-4-sum-and-product-laws/