# WST01 Probability Topic Questions

> Edexcel IAL WST01: every Probability topic question from 36 papers (2014–2026), grouped by syllabus point. 291 questions, 749 marks, with direct links into…

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Edexcel IAL · Mathematics · WST01 · A Level

Every WST01 Probability topic question from the 2014–current syllabus, drawn from 36 papers (2014–2026) and grouped by syllabus point. Each row opens a page listing the exact question numbers, marks and a direct link into the paper. These are questions by topic, not full papers, so you can revise one topic at a time.

- WST01
- 5 subtopics
- 291 topic questions
- 36 papers
- 749 tagged marks
- [Back to Probability](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-1-wst01/probability/)
- [All paper codes](https://www.examsci.com/topics/)

Core finding

**3.2 Sample space. Exclusive and complementary events. Conditional… is the most frequently assessed subtopic in Probability, with 196 topic questions and 531 marks across 36 papers.** 3.4 Sum and product laws. follows with 118 topic questions and 324 marks. The topic contains 5 subtopics, 291 topic questions and 749 marks in total. Rows count only the parts tagged to that subtopic, keep the same colour in both charts and repeat paper count, tagged marks and year range in the native table.

## Topic question count and mark distribution

Subtopics are on the vertical axis and sorted from highest to lowest. Only the parts whose knowledge graph matches a subtopic are counted for it, and percentages are each row's share of the tagged total in that chart. A part tagged to several subtopics is counted in each bar, so the bars are not a partition of the topic total.

### Questions by subtopic

question items

- [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/) (36 papers) — 196 · 44.9%
- [3.4 Sum and product laws.](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-1-wst01/probability/3-4-sum-and-product-laws/) (35 papers) — 118 · 27.0%
- [3.1 Elementary probability.](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-1-wst01/probability/3-1-elementary-probability/) (35 papers) — 82 · 18.8%
- [3.3 Independence of two events.](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-1-wst01/probability/3-3-independence-of-two-events/) (28 papers) — 40 · 9.2%
- [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 papers) — 1 · 0.2%

### Marks by subtopic

marks

- [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/) (36 papers) — 531 · 45.8%
- [3.4 Sum and product laws.](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-1-wst01/probability/3-4-sum-and-product-laws/) (35 papers) — 324 · 27.9%
- [3.1 Elementary probability.](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-1-wst01/probability/3-1-elementary-probability/) (35 papers) — 188 · 16.2%
- [3.3 Independence of two events.](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-1-wst01/probability/3-3-independence-of-two-events/) (28 papers) — 113 · 9.7%
- [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 papers) — 4 · 0.3%

## Subtopic comparison matrix

Curriculum order is by syllabus number, then alphabetically. Every row links to the matching past-paper question list.

| Subtopic | Topic questions | Papers | Marks | Years | |
| --- | --- | --- | --- | --- | --- |
| **[3.1 Elementary probability.](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-1-wst01/probability/3-1-elementary-probability/)** | 82 | 35 | 188 | 2014–2026 | [Open topic questions](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-1-wst01/probability/3-1-elementary-probability/) |
| **[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 | 36 | 531 | 2014–2026 | [Open topic questions](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-1-wst01/probability/3-2-sample-space-exclusive-and-complementary-events-conditional-probability/) |
| **[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 | 28 | 113 | 2014–2026 | [Open topic questions](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-1-wst01/probability/3-3-independence-of-two-events/) |
| **[3.4 Sum and product laws.](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-1-wst01/probability/3-4-sum-and-product-laws/)** | 118 | 35 | 324 | 2014–2026 | [Open topic questions](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-1-wst01/probability/3-4-sum-and-product-laws/) |
| **[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 | 1 | 4 | 2023 | [Open topic questions](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/) |

## Browse every topic question

- [3.1 Elementary probability.](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-1-wst01/probability/3-1-elementary-probability/) — 82 question items · 35 papers — 188 marks · 2014–2026
- [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
- [3.4 Sum and product laws.](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-1-wst01/probability/3-4-sum-and-product-laws/) — 118 question items · 35 papers — 324 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

## Other topics in WST01

- [Correlation and regression 239 question items](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-1-wst01/correlation-and-regression/)
- [Discrete random variables 227 question items](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-1-wst01/discrete-random-variables/)
- [Mathematical models in probability and statistics 11 question items](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-1-wst01/mathematical-models-in-probability-and-statistics/)
- [Representation and summary of data 270 question items](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-1-wst01/representation-and-summary-of-data/)
- [The Normal distribution 139 question items](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-1-wst01/the-normal-distribution/)

## Topic question rules and edge cases

**How many subtopics does Probability contain?**

This page lists 5 subtopics tagged to the current syllabus. They are ordered by syllabus number, then alphabetically, and each row opens a page of matching past-paper questions.

**How are the subtopic question and mark totals calculated?**

A multiple-choice question contributes one item and its marks to every subtopic it is tagged with. A structured question contributes one item per tagged part, and that part’s marks; untagged parts of the same question are not counted here. A part tagged to several subtopics therefore appears under each of them.

**Why do some subtopics have no numbered prefix?**

Practical-skills statements and some syllabus bullets are unnumbered. Numbered statements come first; unnumbered statements and ties are sorted alphabetically.

**Is the LaTeX rendered without JavaScript?**

Yes. Subtopics that contain formulas are converted to static KaTeX HTML during the build, and the KaTeX stylesheet is served from the same site.

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