Mathematics 9709 · 6 Probability & Statistics 2 (for Paper 6)
6.2 Linear combinations of random variables
Calculate expectation and variance of linear combinations of independent random variables; apply to normal and Poisson distributions.
- Questions
- 73
- Years
- 2015–2026
- Multiple choice
- 0
- Written answer
- 73
- Average marks
- 7.6
Practise probability & statistics 2 (for paper 6) questions with instant markingTeachers: build a worksheet from past papers
Where this subtopic appears
- Paper 7variants 71, 72, 7340
- Paper 6variants 61, 62, 63, 6533
Questions by year
| Year | Feb/March | May/June | Oct/Nov | Total |
|---|---|---|---|---|
| 2026 | – | 5 | – | 5 |
| 2023 | 1 | 3 | 3 | 7 |
| 2022 | 1 | 4 | 3 | 8 |
| 2021 | 1 | 3 | 2 | 6 |
| 2020 | 1 | 3 | 3 | 7 |
| 2019 | 1 | 4 | 2 | 7 |
| 2018 | 1 | 3 | 4 | 8 |
| 2017 | 1 | 4 | 3 | 8 |
| 2016 | 3 | 3 | 3 | 9 |
| 2015 | – | 5 | 3 | 8 |
