# WST02 Continuous random variables Topic Questions > Edexcel IAL WST02: every Continuous random variables topic question from 36 papers (2014–2026), grouped by syllabus point. 316 questions, 912 marks, with… - Canonical HTML: https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-2-wst02/continuous-random-variables/ - Markdown mirror: https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-2-wst02/continuous-random-variables/index.md --- Edexcel IAL · Mathematics · WST02 · A Level Every WST02 Continuous random variables 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. - WST02 - 5 subtopics - 316 topic questions - 36 papers - 912 tagged marks - [Back to Continuous random variables](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-2-wst02/continuous-random-variables/) - [All paper codes](https://www.examsci.com/topics/) Core finding **2.2 The probability density function and the cumulative distribution… is the most frequently assessed subtopic in Continuous random variables, with 187 topic questions and 547 marks across 36 papers.** 2.4 Mean and variance of continuous random variables. follows with 77 topic questions and 281 marks. The topic contains 5 subtopics, 316 topic questions and 912 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 - [2.2 The probability density function and the cumulative distribution function for a continuous random variable.](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-2-wst02/continuous-random-variables/2-2-the-probability-density-function-and-the-cumulative-distribution-function-for-a/) (36 papers) — 187 · 45.8% - [2.4 Mean and variance of continuous random variables.](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-2-wst02/continuous-random-variables/2-4-mean-and-variance-of-continuous-random-variables/) (35 papers) — 77 · 18.9% - [2.5 Mode, median and quartiles of continuous random variables.](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-2-wst02/continuous-random-variables/2-5-mode-median-and-quartiles-of-continuous-random-variables/) (34 papers) — 73 · 17.9% - [2.3 Relationship between density and distribution functions.](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-2-wst02/continuous-random-variables/2-3-relationship-between-density-and-distribution-functions/) (36 papers) — 57 · 14.0% - [2.1 The concept of a continuous random variable.](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-2-wst02/continuous-random-variables/2-1-the-concept-of-a-continuous-random-variable/) (11 papers) — 14 · 3.4% ### Marks by subtopic marks - [2.2 The probability density function and the cumulative distribution function for a continuous random variable.](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-2-wst02/continuous-random-variables/2-2-the-probability-density-function-and-the-cumulative-distribution-function-for-a/) (36 papers) — 547 · 43.8% - [2.4 Mean and variance of continuous random variables.](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-2-wst02/continuous-random-variables/2-4-mean-and-variance-of-continuous-random-variables/) (35 papers) — 281 · 22.5% - [2.3 Relationship between density and distribution functions.](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-2-wst02/continuous-random-variables/2-3-relationship-between-density-and-distribution-functions/) (36 papers) — 213 · 17.1% - [2.5 Mode, median and quartiles of continuous random variables.](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-2-wst02/continuous-random-variables/2-5-mode-median-and-quartiles-of-continuous-random-variables/) (34 papers) — 180 · 14.4% - [2.1 The concept of a continuous random variable.](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-2-wst02/continuous-random-variables/2-1-the-concept-of-a-continuous-random-variable/) (11 papers) — 27 · 2.2% ## 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 | | | --- | --- | --- | --- | --- | --- | | **[2.1 The concept of a continuous random variable.](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-2-wst02/continuous-random-variables/2-1-the-concept-of-a-continuous-random-variable/)** | 14 | 11 | 27 | 2015–2026 | [Open topic questions](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-2-wst02/continuous-random-variables/2-1-the-concept-of-a-continuous-random-variable/) | | **[2.2 The probability density function and the cumulative distribution function for a continuous random variable.](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-2-wst02/continuous-random-variables/2-2-the-probability-density-function-and-the-cumulative-distribution-function-for-a/)** | 187 | 36 | 547 | 2014–2026 | [Open topic questions](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-2-wst02/continuous-random-variables/2-2-the-probability-density-function-and-the-cumulative-distribution-function-for-a/) | | **[2.3 Relationship between density and distribution functions.](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-2-wst02/continuous-random-variables/2-3-relationship-between-density-and-distribution-functions/)** | 57 | 36 | 213 | 2014–2026 | [Open topic questions](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-2-wst02/continuous-random-variables/2-3-relationship-between-density-and-distribution-functions/) | | **[2.4 Mean and variance of continuous random variables.](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-2-wst02/continuous-random-variables/2-4-mean-and-variance-of-continuous-random-variables/)** | 77 | 35 | 281 | 2014–2026 | [Open topic questions](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-2-wst02/continuous-random-variables/2-4-mean-and-variance-of-continuous-random-variables/) | | **[2.5 Mode, median and quartiles of continuous random variables.](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-2-wst02/continuous-random-variables/2-5-mode-median-and-quartiles-of-continuous-random-variables/)** | 73 | 34 | 180 | 2014–2026 | [Open topic questions](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-2-wst02/continuous-random-variables/2-5-mode-median-and-quartiles-of-continuous-random-variables/) | ## Browse every topic question - [2.1 The concept of a continuous random variable.](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-2-wst02/continuous-random-variables/2-1-the-concept-of-a-continuous-random-variable/) — 14 question items · 11 papers — 27 marks · 2015–2026 - [2.2 The probability density function and the cumulative distribution function for a continuous random variable.](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-2-wst02/continuous-random-variables/2-2-the-probability-density-function-and-the-cumulative-distribution-function-for-a/) — 187 question items · 36 papers — 547 marks · 2014–2026 - [2.3 Relationship between density and distribution functions.](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-2-wst02/continuous-random-variables/2-3-relationship-between-density-and-distribution-functions/) — 57 question items · 36 papers — 213 marks · 2014–2026 - [2.4 Mean and variance of continuous random variables.](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-2-wst02/continuous-random-variables/2-4-mean-and-variance-of-continuous-random-variables/) — 77 question items · 35 papers — 281 marks · 2014–2026 - [2.5 Mode, median and quartiles of continuous random variables.](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-2-wst02/continuous-random-variables/2-5-mode-median-and-quartiles-of-continuous-random-variables/) — 73 question items · 34 papers — 180 marks · 2014–2026 ## Other topics in WST02 - [Continuous distributions 192 question items](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-2-wst02/continuous-distributions/) - [Hypothesis tests 217 question items](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-2-wst02/hypothesis-tests/) - [The Binomial and Poisson distributions 309 question items](https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-2-wst02/the-binomial-and-poisson-distributions/) ## Topic question rules and edge cases **How many subtopics does Continuous random variables 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. --- Full page with native tables, bar charts and Practice Hub links: https://www.examsci.com/topics/edexcel-ial/mathematics/statistics-2-wst02/continuous-random-variables/