Edexcel IAL · Mathematics · WST01 · Probability
Topic Questions: 3.2 Sample space. Exclusive and complementary events. Conditional probability. — WST01 Probability
196 WST01 Probability topic questions are tagged to this syllabus point across 36 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.
Core finding
This Probability syllabus point appears in 36 WST01 papers across 2014–2026, contributing 196 topic questions and 531 marks. The most recent appearance is WST01/01 January 2026. That equals 67.4% of the 291 topic questions and 70.9% 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 |
|---|---|---|---|---|---|---|
| WST01/01January 2026 · Edexcel IAL | Q3 Venn Diagrams and Conditional Probability - Edexcel IAL S1 Jan 2026 Q3 |
FRQ | 5 parts ((a)(i), (a)(ii), (b), (c)(i), (c)(ii)) | 9 | Easy | Go to Practice Hub |
| WST01/01January 2026 · Edexcel IAL | Q5 Probability Tree Diagrams and Conditional Probability - Edexcel IAL S1 Jan 2026 Q5 |
FRQ | 3 parts ((a), (b), (c)) | 10 | Medium | Go to Practice Hub |
| WST01/01January 2026 · Edexcel IAL | Q7 Normal Distribution and Standardisation - Edexcel IAL S1 Jan 2026 Q7 |
FRQ | 1 of 4 parts ((c)(i)) | 2 of 9 on the paper |
Easy | Go to Practice Hub |
| WST01/02January 2026 · Edexcel IAL | Q4 Probability - Jan 2026 Q4 |
FRQ | 3 of 5 parts ((b), (c), (d)) | 7 of 11 on the paper |
Medium | Go to Practice Hub |
| WST01/02January 2026 · Edexcel IAL | Q7 Venn Diagrams and Probability Laws - Jan 2026 Q7 |
FRQ | 4 parts ((a), (b), (c), (d)) | 12 | Medium | Go to Practice Hub |
| WST01/01October 2025 · Edexcel IAL | Q6 Venn Diagram and Conditional Probability |
FRQ | 4 parts ((a), (b), (c), (d)) | 9 | Medium | Go to Practice Hub |
| WST01/01October 2025 · Edexcel IAL | Q7 Butterfly Wingspans Normal Distribution Calculations |
FRQ | 1 of 3 parts ((b)) | 3 of 10 on the paper |
Medium | Go to Practice Hub |
| WST01/01October 2025 · Edexcel IAL | Q8 Paul's Work Travel Probabilities and Tree Diagram |
FRQ | 2 of 3 parts ((b), (c)) | 6 of 7 on the paper |
Easy | Go to Practice Hub |
| WST01/02October 2025 · Edexcel IAL | Q2 Discrete Probability Distributions - Edexcel IAL S1 October 2025 Q2 |
FRQ | 1 of 5 parts ((e)) | 3 of 10 on the paper |
Easy | Go to Practice Hub |
| WST01/02October 2025 · Edexcel IAL | Q4 The Normal Distribution - Edexcel IAL S1 October 2025 Q4 |
FRQ | 1 of 4 parts ((c)) | 3 of 11 on the paper |
Medium | Go to Practice Hub |
| WST01/02October 2025 · Edexcel IAL | Q5 Probability and Venn/Tree Diagrams - Edexcel IAL S1 October 2025 Q5 |
FRQ | 3 of 4 parts ((b), (c), (d)) | 8 of 9 on the paper |
Easy | Go to Practice Hub |
| WST01/01June 2025 · Edexcel IAL | Q4 Basic Probability Laws - Edexcel IAL June 2025 S1 Q4 |
FRQ | 2 parts ((a), (b)) | 4 | Easy | Go to Practice Hub |
| WST01/01June 2025 · Edexcel IAL | Q7 Tree Diagrams and Conditional Probability - Edexcel IAL June 2025 S1 Q7 |
FRQ | 5 parts ((a), (b), (c), (d), (e)) | 13 | Easy | Go to Practice Hub |
| WST01/01January 2025 · Edexcel IAL | Q3 Tree Diagrams and Conditional Probability - Edexcel IAL S1 Jan 2025 Q3 |
FRQ | 2 of 3 parts ((b)(i), (b)(ii)) | 4 of 6 on the paper |
Medium | Go to Practice Hub |
| WST01/01January 2025 · Edexcel IAL | Q4 Venn Diagrams, Independence, and Conditional Probability - Edexcel IAL S1 Jan 2025 Q4 |
FRQ | 2 of 4 parts ((a), (c)(ii)) | 6 of 9 on the paper |
Easy | Go to Practice Hub |
| WST01/01October 2024 · Edexcel IAL | Q3 Venn Diagrams and Probability - Edexcel IAL S1 Oct 2024 Q3 |
FRQ | 4 parts ((a), (b)(i), (b)(ii), (c)) | 8 | Easy | Go to Practice Hub |
| WST01/01October 2024 · Edexcel IAL | 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 |
| WST01/01June 2024 · Edexcel IAL | Q5 The Normal Distribution - Edexcel IAL Statistics S1 June 2024 Q5 |
FRQ | 1 of 3 parts ((c)) | 5 of 10 on the paper |
Easy | Go to Practice Hub |
| WST01/01June 2024 · Edexcel IAL | Q6 Probability and Venn Diagrams - Edexcel IAL Statistics S1 June 2024 Q6 |
FRQ | 3 of 5 parts ((a), (c), (d)) | 6 of 13 on the paper |
Medium | Go to Practice Hub |
| WST01/01January 2024 · Edexcel IAL | Q3 Sixth Form College Handedness - Edexcel IAL S1 Jan 2024 Q3 |
FRQ | 3 of 4 parts ((a), (b), (d)) | 6 of 8 on the paper |
Easy | Go to Practice Hub |
| WST01/01January 2024 · Edexcel IAL | 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 |
| WST01/01January 2024 · Edexcel IAL | Q6 Probability Events and Equations - Edexcel IAL S1 Jan 2024 Q6 |
FRQ | 2 of 3 parts ((a), (b)) | 7 of 9 on the paper |
Medium | Go to Practice Hub |
| WST01/01October 2023 · Edexcel IAL | Q1 Probability Tree Diagrams and Conditional Probability - Edexcel IAL Statistics S1 Oct 2023 Q1 |
FRQ | 3 of 5 parts ((a), (d), (e)) | 7 of 11 on the paper |
Medium | Go to Practice Hub |
| WST01/01October 2023 · Edexcel IAL | Q3 Venn Diagrams and Probability Laws - Edexcel IAL Statistics S1 Oct 2023 Q3 |
FRQ | 3 of 6 parts ((i)(a), (i)(b), (ii)(a)) | 6 of 12 on the paper |
Easy | Go to Practice Hub |
| WST01/01October 2023 · Edexcel IAL | Q4 Discrete Random Variables, Expectation, and Variance - Edexcel IAL Statistics S1 Oct 2023 Q4 |
FRQ | 1 of 5 parts ((d)) | 5 of 12 on the paper |
Medium | Go to Practice Hub |
| WST01/01June 2023 · Edexcel IAL | Q4 Probability Tree Diagrams and Conditional Probability - Edexcel IAL S1 Jun 2023 Q4 |
FRQ | 3 of 4 parts ((a), (c), (d)) | 7 of 9 on the paper |
Easy | Go to Practice Hub |
| WST01/01June 2023 · Edexcel IAL | Q6 Venn Diagrams and Probability Laws - Edexcel IAL S1 Jun 2023 Q6 |
FRQ | 3 parts ((a), (b), (c)) | 9 | Easy | Go to Practice Hub |
| WST01/01January 2023 · Edexcel IAL | Q2 Probability Tree Diagram and Conditional Probability - Edexcel IAL S1 January 2023 Q2 |
FRQ | 2 of 4 parts ((a), (d)) | 6 of 10 on the paper |
Easy | Go to Practice Hub |
| WST01/01January 2023 · Edexcel IAL | Q4 Venn Diagrams and Probability Algebra - Edexcel IAL S1 January 2023 Q4 |
FRQ | 3 parts ((i)(a), (i)(b), (ii)) | 13 | Easy | Go to Practice Hub |
| WST01/01October 2022 · Edexcel IAL | Q5 Normal Distribution Weight Classification - Edexcel IAL S1 Oct 2022 Q5 |
FRQ | 1 of 3 parts ((c)) | 5 of 12 on the paper |
Easy | Go to Practice Hub |
| WST01/01October 2022 · Edexcel IAL | Q6 Venn Diagram Probability Analysis - Edexcel IAL S1 Oct 2022 Q6 |
FRQ | 3 parts ((a), (b), (c)) | 11 | Easy | Go to Practice Hub |
| WST01/01October 2022 · Edexcel IAL | Q7 Discrete Probability Distribution and Multi-variable Joint Events - Edexcel IAL S1 Oct 2022 Q7 |
FRQ | 1 of 6 parts ((a)) | 1 of 14 on the paper |
Easy | Go to Practice Hub |
| WST01/01June 2022 · Edexcel IAL | Q4 Probability - Independence, Conditional Probability, and Venn Diagrams |
FRQ | 3 parts ((a), (b), (c)) | 11 | Medium | Go to Practice Hub |
| WST01/01June 2022 · Edexcel IAL | Q6 The Normal Distribution - Probabilities, Expected Frequency, and Conditional Probability |
FRQ | 1 of 3 parts ((c)) | 6 of 11 on the paper |
Easy | Go to Practice Hub |
| WST01/01January 2022 · Edexcel IAL | Q1 Venn Diagrams and Probability - Edexcel IAL S1 Jan 2022 Q1 |
FRQ | 4 of 6 parts ((a), (b), (c), (e)) | 6 of 11 on the paper |
Easy | Go to Practice Hub |
| WST01/01January 2022 · Edexcel IAL | Q3 Stem and Leaf Outliers and Coding - Edexcel IAL S1 Jan 2022 Q3 |
FRQ | 1 of 4 parts ((d)) | 2 of 10 on the paper |
Medium | Go to Practice Hub |
| WST01/01January 2022 · Edexcel IAL | 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 |
| WST01/01October 2021 · Edexcel IAL | Q1 Venn Diagram and Probability - Edexcel IAL S1 Oct 2021 Q1 |
FRQ | 3 of 4 parts ((a), (c), (d)) | 5 of 7 on the paper |
Easy | Go to Practice Hub |
| WST01/01October 2021 · Edexcel IAL | Q4 Probability Tree Diagram and Discrete Random Variables - Edexcel IAL S1 Oct 2021 Q4 |
FRQ | 2 of 5 parts ((b), (c)) | 5 of 13 on the paper |
Medium | Go to Practice Hub |
| WST01/01June 2021 · Edexcel IAL | Q1 Probability Tree Diagrams - Edexcel IAL S1 Jun 2021 Q1 |
FRQ | 2 parts ((a), (b)) | 5 | Easy | Go to Practice Hub |
| WST01/01June 2021 · Edexcel IAL | Q2 Venn Diagrams & Independence - Edexcel IAL S1 Jun 2021 Q2 |
FRQ | 3 parts ((a), (b), (c)) | 12 | Easy | Go to Practice Hub |
| WST01/01January 2021 · Edexcel IAL | Q1 Probability and Venn Diagrams - Edexcel IAL S1 Jan 2021 Q1 |
FRQ | 3 parts ((a), (b), (c)) | 5 | Easy | Go to Practice Hub |
| WST01/01January 2021 · Edexcel IAL | Q3 Normal Distribution Calculations - Edexcel IAL S1 Jan 2021 Q3 |
FRQ | 1 of 4 parts ((c)) | 4 of 13 on the paper |
Medium | Go to Practice Hub |
| WST01/01October 2020 · Edexcel IAL | Q2 Probability Tree Diagram and Independence - Edexcel IAL S1 Oct 2020 Q2 |
FRQ | 4 of 5 parts ((a), (c), (d), (e)) | 12 of 13 on the paper |
Medium | Go to Practice Hub |
| WST01/01October 2020 · Edexcel IAL | Q3 Normal Distribution - Edexcel IAL S1 Oct 2020 Q3 |
FRQ | 2 of 4 parts ((c), (d)) | 7 of 13 on the paper |
Medium | Go to Practice Hub |
| WST01/01January 2020 · Edexcel IAL | Q2 Probability and Venn Diagrams - Families and Pets |
FRQ | 4 of 6 parts ((a), (b), (e), (f)) | 9 of 12 on the paper |
Easy | Go to Practice Hub |
| WST01/01October 2019 · Edexcel IAL | Q2 Representation of Data - Edexcel IAL Statistics S1 Oct 2019 Q2 |
FRQ | 1 of 5 parts ((e)) | 4 of 13 on the paper |
Easy | Go to Practice Hub |
| WST01/01October 2019 · Edexcel IAL | 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 |
| WST01/01October 2019 · Edexcel IAL | Q5 Probability - Edexcel IAL Statistics S1 Oct 2019 Q5 |
FRQ | 4 of 5 parts ((a), (b), (c), (e)) | 10 of 12 on the paper |
Easy | Go to Practice Hub |
| WST01/01June 2019 · Edexcel IAL | Q3 Disease Diagnosis Tree Diagram - Edexcel IAL S1 Jun 2019 Q3 |
FRQ | 4 parts ((a), (b), (c)(i), (c)(ii)) | 13 | Medium | Go to Practice Hub |
| WST01/01June 2019 · Edexcel IAL | Q4 Weights of Packages Normal Distribution - Edexcel IAL S1 Jun 2019 Q4 |
FRQ | 1 of 4 parts ((c)) | 4 of 13 on the paper |
Medium | Go to Practice Hub |
| WST01/01June 2019 · Edexcel IAL | 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 |
| WST01/01January 2019 · Edexcel IAL | Q1 Venn Diagram and Probability - Edexcel IAL S1 Jan 2019 Q1 |
FRQ | 3 of 4 parts ((a), (c), (d)) | 7 of 9 on the paper |
Easy | Go to Practice Hub |
| WST01/01January 2019 · Edexcel IAL | Q3 Normal Distribution and Conditional Probability - Edexcel IAL S1 Jan 2019 Q3 |
FRQ | 1 of 3 parts ((b)) | 4 of 10 on the paper |
Medium | Go to Practice Hub |
| WST01/01January 2019 · Edexcel IAL | Q5 Probability Modelling and Evaluation - Edexcel IAL S1 Jan 2019 Q5 |
FRQ | 2 of 6 parts ((c), (d)) | 6 of 15 on the paper |
Easy | Go to Practice Hub |
| WST01/01October 2018 · Edexcel IAL | Q4 Venn Diagrams and Probability Laws - Edexcel IAL S1 Oct 2018 Q4 |
FRQ | 3 of 4 parts ((a), (b), (c)) | 7 of 10 on the paper |
Easy | Go to Practice Hub |
| WST01/01June 2018 · Edexcel IAL | Q3 Probability and Tree Diagrams - Edexcel IAL S1 June 2018 Q3 |
FRQ | 2 of 4 parts ((a), (d)) | 4 of 7 on the paper |
Easy | Go to Practice Hub |
| WST01/01June 2018 · Edexcel IAL | Q7 Probability Laws and Venn Diagrams - Edexcel IAL S1 June 2018 Q7 |
FRQ | 3 of 4 parts ((a), (b), (d)) | 10 of 12 on the paper |
Medium | Go to Practice Hub |
| WST01/01January 2018 · Edexcel IAL | Q2 Venn Diagrams and Probability Laws - Edexcel IAL S1 Jan 2018 Q2 |
FRQ | 3 parts ((a), (b), (c)) | 8 | Easy | Go to Practice Hub |
| WST01/01January 2018 · Edexcel IAL | Q6 Probability without Replacement - Edexcel IAL S1 Jan 2018 Q6 |
FRQ | 4 of 5 parts ((b), (c), (d), (e)) | 10 of 11 on the paper |
Medium | Go to Practice Hub |
| WST01/01October 2017 · Edexcel IAL | Q2 Venn diagram and probability - Edexcel IAL S1 Oct 2017 Q2 |
FRQ | 2 of 6 parts ((a), (f)) | 4 of 11 on the paper |
Easy | Go to Practice Hub |
| WST01/01October 2017 · Edexcel IAL | Q3 Normal distribution and conditional probability - Edexcel IAL S1 Oct 2017 Q3 |
FRQ | 2 of 5 parts ((d), (e)) | 5 of 12 on the paper |
Medium | Go to Practice Hub |
| WST01/01October 2017 · Edexcel IAL | Q4 Tree diagram and probability - Edexcel IAL S1 Oct 2017 Q4 |
FRQ | 1 of 2 parts ((b)) | 2 of 8 on the paper |
Medium | Go to Practice Hub |
| WST01/01October 2017 · Edexcel IAL | Q6 Discrete random variables and expectations - Edexcel IAL S1 Oct 2017 Q6 |
FRQ | 1 of 8 parts ((h)) | 3 of 17 on the paper |
Medium | Go to Practice Hub |
| WST01/01June 2017 · Edexcel IAL | Q3 The Normal distribution - Edexcel IAL S1 June 2017 Q3 |
FRQ | 1 of 4 parts ((c)) | 3 of 12 on the paper |
Medium | Go to Practice Hub |
| WST01/01June 2017 · Edexcel IAL | Q4 Tree diagrams and probability - Edexcel IAL S1 June 2017 Q4 |
FRQ | 2 of 4 parts ((b), (d)) | 7 of 12 on the paper |
Medium | Go to Practice Hub |
| WST01/01January 2017 · Edexcel IAL | Q2 Probability and Venn Diagrams - Edexcel IAL S1 Jan 2017 Q2 |
FRQ | 4 of 6 parts ((a), (c), (d), (f)) | 6 of 9 on the paper |
Easy | Go to Practice Hub |
| WST01/01January 2017 · Edexcel IAL | Q5 Probability and Tree Diagrams - Edexcel IAL S1 Jan 2017 Q5 |
FRQ | 3 parts ((a), (b), (c)) | 6 | Medium | Go to Practice Hub |
| WST01/01October 2016 · Edexcel IAL | Q1 Normal Distribution probabilities - Edexcel IAL S1 Oct 2016 Q1 |
FRQ | 1 of 3 parts ((c)) | 2 of 5 on the paper |
Easy | Go to Practice Hub |
| WST01/01October 2016 · Edexcel IAL | Q3 Venn Diagrams and Probability - Edexcel IAL S1 Oct 2016 Q3 |
FRQ | 3 of 5 parts ((a), (b)(ii), (c)) | 9 of 12 on the paper |
Medium | Go to Practice Hub |
| WST01/01June 2016 · Edexcel IAL | Q5 Biased Tetrahedral Die Game - Edexcel IAL S1 June 2016 Q5 |
FRQ | 2 of 3 parts ((b), (c)) | 6 of 8 on the paper |
Medium | Go to Practice Hub |
| WST01/01June 2016 · Edexcel IAL | Q6 Venn Diagrams and Probability Laws - Edexcel IAL S1 June 2016 Q6 |
FRQ | 3 of 4 parts ((a), (c), (d)) | 7 of 11 on the paper |
Easy | Go to Practice Hub |
| WST01/01January 2016 · Edexcel IAL | Q4 Probability - Edexcel IAL S1 Jan 2016 Q4 |
FRQ | 4 of 5 parts ((a), (b), (c), (d)) | 10 of 13 on the paper |
Medium | Go to Practice Hub |
| WST01/01January 2016 · Edexcel IAL | Q5 The Normal Distribution - Edexcel IAL S1 Jan 2016 Q5 |
FRQ | 1 of 3 parts ((b)) | 5 of 14 on the paper |
Medium | Go to Practice Hub |
| WST01/01June 2015 · Edexcel IAL | Q3 Conditional Probability and Independence - Edexcel IAL S1 June 2015 Q3 |
FRQ | 2 of 4 parts ((b), (c)) | 4 of 8 on the paper |
Easy | Go to Practice Hub |
| WST01/01June 2015 · Edexcel IAL | Q4 Probability Laws and Sampling - Edexcel IAL S1 June 2015 Q4 |
FRQ | 1 of 4 parts ((d)) | 3 of 9 on the paper |
Easy | Go to Practice Hub |
| WST01/01January 2015 · Edexcel IAL | Q1 Discrete Random Variables - Edexcel IAL S1 Jan 2015 Q1 |
FRQ | 1 of 5 parts ((e)) | 3 of 10 on the paper |
Easy | Go to Practice Hub |
| WST01/01January 2015 · Edexcel IAL | Q4 Probability & Venn Diagrams - Edexcel IAL S1 Jan 2015 Q4 |
FRQ | 3 of 4 parts ((a)(i), (a)(ii), (c)) | 8 of 9 on the paper |
Easy | Go to Practice Hub |
| WST01/01January 2015 · Edexcel IAL | Q6 Discrete Probability Function - Edexcel IAL S1 Jan 2015 Q6 |
FRQ | 1 of 5 parts ((b)) | 2 of 14 on the paper |
Easy | Go to Practice Hub |
| WST01/01June 2014 · Edexcel IAL | Q4 Normal Distribution Probabilities - Edexcel IAL Statistics S1 June 2014 Q4 |
FRQ | 1 of 3 parts ((c)) | 2 of 5 on the paper |
Medium | Go to Practice Hub |
| WST01/01June 2014 · Edexcel IAL | Q6 Venn Diagram and Restaurant Bookings - Edexcel IAL Statistics S1 June 2014 Q6 |
FRQ | 4 parts ((a), (b), (c), (d)) | 12 | Medium | Go to Practice Hub |
| WST01/01January 2014 · Edexcel IAL | Q5 Venn Diagrams and Probability - Edexcel IAL S1 Jan 2014 Q5 |
FRQ | 3 of 6 parts ((a), (b), (f)) | 7 of 10 on the paper |
Easy | Go to Practice Hub |
| WST01/01January 2014 · Edexcel IAL | Q7 Conditional Probability - Edexcel IAL S1 Jan 2014 Q7 |
FRQ | 3 of 4 parts ((a), (b), (c)) | 7 of 9 on the paper |
Medium | Go to Practice Hub |
Related topic questions in Probability
Topic question rules and edge cases
- How many topic questions cover this syllabus point?
- 83 question stems cover this subtopic across 36 papers, but only 196 tagged parts and 531 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.