Edexcel IAL · Mathematics · WST03 · Combinations of random variables
Topic Questions: 1.1 Distribution of linear combinations of independent Normal random variables. — WST03 Combinations of random variables
62 WST03 Combinations of random variables topic questions are tagged to this syllabus point across 21 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 Combinations of random variables syllabus point appears in 21 WST03 papers across 2014–2026, contributing 62 topic questions and 305 marks. The most recent appearance is WST03/01 January 2026. That equals 100.0% of the 62 topic questions and 100.0% of the 305 marks tagged to Combinations of random variables. 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 |
|---|---|---|---|---|---|---|
| WST03/01January 2026 · Edexcel IAL | Q8 Linear Combinations of Normal Random Variables - Jan 2026 Q8 |
FRQ | 3 parts ((a), (b), (c)) | 13 | Easy | Go to Practice Hub |
| WST03/02January 2026 · Edexcel IAL | Q7 Linear Combinations of Normal Random Variables - Edexcel IAL Statistics S3 Jan 2026 Q7 |
FRQ | 3 parts ((i)(a), (i)(b), (ii)) | 15 | Medium | Go to Practice Hub |
| WST03/01June 2025 · Edexcel IAL | Q8 Linear Combinations of Normal Variables - Edexcel IAL S3 2025 Jun Q8 |
FRQ | 3 parts ((a), (b), (c)) | 15 | Medium | Go to Practice Hub |
| WST03/01January 2025 · Edexcel IAL | Q7 Linear Combinations of Normal Variables - Edexcel IAL Statistics S3 Jan 2025 Q7 |
FRQ | 3 parts ((a), (b), (c)) | 15 | Medium | Go to Practice Hub |
| WST03/01June 2024 · Edexcel IAL | Q6 Combinations of Normal Random Variables - Edexcel IAL Statistics S3 2024 Jun Q6 |
FRQ | 3 parts ((a), (b), (c)) | 16 | Medium | Go to Practice Hub |
| WST03/01January 2024 · Edexcel IAL | Q7 Linear Combinations of Normal Random Variables - Edexcel IAL Statistics S3 January 2024 Q7 |
FRQ | 3 parts ((a), (b), (c)) | 14 | Easy | Go to Practice Hub |
| WST03/01June 2023 · Edexcel IAL | Q5 Confidence Intervals and Independent Normal Distributions - Edexcel IAL Statistics S3 2023 Jun Q5 |
FRQ | 2 of 4 parts ((c)(i), (c)(ii)) | 7 of 13 on the paper |
Medium | Go to Practice Hub |
| WST03/01June 2023 · Edexcel IAL | Q7 Linear Combinations of Normal Variables - Edexcel IAL Statistics S3 2023 Jun Q7 |
FRQ | 2 parts ((a), (b)) | 10 | Medium | Go to Practice Hub |
| WST03/01January 2023 · Edexcel IAL | Q7 Linear Combinations of Normal Variables - Edexcel IAL S3 Jan 2023 Q7 |
FRQ | 3 parts ((a), (b), (c)) | 8 | Medium | Go to Practice Hub |
| WST03/01June 2022 · Edexcel IAL | Q5 Estimation and Unbiased Estimators - Edexcel IAL Statistics S3 2022 Jun Q5 |
FRQ | 2 of 4 parts ((c), (d)) | 7 of 9 on the paper |
Easy | Go to Practice Hub |
| WST03/01June 2022 · Edexcel IAL | Q6 Combinations of Random Variables - Edexcel IAL Statistics S3 2022 Jun Q6 |
FRQ | 2 parts ((a), (b)) | 10 | Medium | Go to Practice Hub |
| WST03/01January 2022 · Edexcel IAL | Q5 Linear Combinations of Normal Random Variables - Edexcel IAL S3 Jan 2022 Q5 |
FRQ | 5 parts ((a), (b), (c), (d), (e)) | 17 | Medium | Go to Practice Hub |
| WST03/02January 2022 · Edexcel IAL | Q7 Linear Combinations of Normal Random Variables - Edexcel IAL Statistics S3 Jan 2022 Q7 |
FRQ | 4 parts ((a), (b), (c), (d)) | 14 | Medium | Go to Practice Hub |
| WST03/01October 2021 · Edexcel IAL | Q7 Linear Combinations of Normal Random Variables - Edexcel IAL Statistics S3 Oct 2021 Q7 |
FRQ | 2 of 3 parts ((a), (c)) | 12 of 17 on the paper |
Medium | Go to Practice Hub |
| WST03/01June 2021 · Edexcel IAL | Q6 Linear Combinations of Normal Variables - Edexcel IAL Statistics 3 June 2021 Q6 |
FRQ | 3 parts ((a), (b), (c)) | 17 | Medium | Go to Practice Hub |
| WST03/01January 2021 · Edexcel IAL | Q6 Combinations of Normal Random Variables - Edexcel IAL Statistics S3 Jan 2021 Q6 |
FRQ | 3 parts ((a), (b), (c)) | 18 | Hard | Go to Practice Hub |
| WST03/01October 2020 · Edexcel IAL | Q7 Linear Combinations of Normal Random Variables - Edexcel IAL Statistics S3 June 2020 Q7 |
FRQ | 3 parts ((a), (b), (c)) | 16 | Easy | Go to Practice Hub |
| WST03/01June 2019 · Edexcel IAL | Q8 Linear Combinations of Normal Random Variables - Edexcel IAL Statistics S3 June 2019 Q8 |
FRQ | 2 parts ((a), (b)) | 13 | Medium | Go to Practice Hub |
| WST03/01June 2018 · Edexcel IAL | Q7 Linear Combinations of Normal Random Variables - Edexcel IAL S3 June 2018 Q7 |
FRQ | 3 parts ((i)(a), (i)(b), (ii)) | 15 | Medium | Go to Practice Hub |
| WST03/01June 2017 · Edexcel IAL | Q7 Linear Combinations of Normal Random Variables - Edexcel IAL Statistics S3 2017 Jun Q7 |
FRQ | 2 parts ((a), (b)) | 12 | Medium | Go to Practice Hub |
| WST03/01June 2016 · Edexcel IAL | Q6 Linear Combinations of Normal Random Variables - Edexcel IAL S3 June 2016 Q6 |
FRQ | 2 parts ((a), (b)) | 15 | Medium | Go to Practice Hub |
| WST03/01June 2015 · Edexcel IAL | Q4 Normal Combinations - Potatoes and Pallets - Edexcel IAL S3 2015 Jun Q4 |
FRQ | 2 parts ((a), (b)) | 11 | Medium | Go to Practice Hub |
| WST03/01June 2014 · Edexcel IAL | Q7 Linear Combinations of Normal Random Variables - Edexcel IAL S3 June 2014 Q7 |
FRQ | 2 parts ((a), (b)) | 15 | Medium | Go to Practice Hub |
Related topic questions in Combinations of random variables
Topic question rules and edge cases
- How many topic questions cover this syllabus point?
- 23 question stems cover this subtopic across 21 papers, but only 62 tagged parts and 305 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.