Edexcel IAL · Mathematics · WST01 · A Level

WST01 Discrete random variables Topic Questions

Every WST01 Discrete 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.

WST01 4 subtopics 227 topic questions 36 papers 550 tagged marks

Back to Discrete random variables All paper codes

Core finding

5.3 Mean and variance of a discrete random variable. is the most frequently assessed subtopic in Discrete random variables, with 120 topic questions and 326 marks across 36 papers. 5.2 The probability function and the cumulative… follows with 112 topic questions and 276 marks. The topic contains 4 subtopics, 227 topic questions and 550 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

5.3 Mean and variance of a discrete random variable. 36 papers

12044.8%

5.2 The probability function and the cumulative distribution function for a discrete random variable. 35 papers

11241.8%

5.4 The discrete uniform distribution. 10 papers

197.1%

5.1 The concept of a discrete random variable. 11 papers

176.3%

Marks by subtopic

marks

5.3 Mean and variance of a discrete random variable. 36 papers

32648.0%

5.2 The probability function and the cumulative distribution function for a discrete random variable. 35 papers

27640.6%

5.1 The concept of a discrete random variable. 11 papers

466.8%

5.4 The discrete uniform distribution. 10 papers

314.6%

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
5.1 The concept of a discrete random variable.	17	11	46	2015–2025	Open topic questions
5.2 The probability function and the cumulative distribution function for a discrete random variable.	112	35	276	2014–2026	Open topic questions
5.3 Mean and variance of a discrete random variable.	120	36	326	2014–2026	Open topic questions
5.4 The discrete uniform distribution.	19	10	31	2015–2026	Open topic questions

Browse every topic question

5.1 The concept of a discrete random variable. 17 question items · 11 papers 46 marks · 2015–2025 5.2 The probability function and the cumulative distribution function for a discrete random variable. 112 question items · 35 papers 276 marks · 2014–2026 5.3 Mean and variance of a discrete random variable. 120 question items · 36 papers 326 marks · 2014–2026 5.4 The discrete uniform distribution. 19 question items · 10 papers 31 marks · 2015–2026

Topic question rules and edge cases

How many subtopics does Discrete random variables contain?: This page lists 4 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.