Discrete random variables: past paper questions
Real questions on discrete random variables
The newest 20 of 28 written questions. Open one to see it on the real paper.
- 9709/61 · May/June 2025 · Q3a[3]
3-mark “Calculate” question — its maths and diagrams are best seen on the paper.
See it on the paper → - 9709/62 · May/June 2025 · Q2[3]
3-mark “Calculate” question — its maths and diagrams are best seen on the paper.
See it on the paper → - 9709/62 · May/June 2025 · Q8a[5]
5-mark “Use” question — its maths and diagrams are best seen on the paper.
See it on the paper → - 9709/62 · May/June 2025 · Q8b[2]
2-mark “Calculate” question — its maths and diagrams are best seen on the paper.
See it on the paper → - 9709/62 · May/June 2025 · Q8c[3]
3-mark question — its maths and diagrams are best seen on the paper.
See it on the paper → - 9709/52 · October/November 2024 · Q1a[1]
1-mark “Find” question — its maths and diagrams are best seen on the paper.
See it on the paper → - 9709/63 · October/November 2024 · Q6a[2]
2-mark “Find” question — its maths and diagrams are best seen on the paper.
See it on the paper → - 9709/63 · October/November 2024 · Q6b[3]
3-mark “Find” question — its maths and diagrams are best seen on the paper.
See it on the paper → - 9709/63 · October/November 2024 · Q6c[4]
4-mark “Find” question — its maths and diagrams are best seen on the paper.
See it on the paper → - 9709/61 · May/June 2024 · Q1[3]
3-mark “Find” question — its maths and diagrams are best seen on the paper.
See it on the paper → - 9709/61 · May/June 2024 · Q5a[1]
1-mark “State” question — its maths and diagrams are best seen on the paper.
See it on the paper → - 9709/61 · May/June 2024 · Q5b[3]
3-mark “Find” question — its maths and diagrams are best seen on the paper.
See it on the paper → - 9709/61 · May/June 2024 · Q5c[4]
4-mark “Use” question — its maths and diagrams are best seen on the paper.
See it on the paper → - 9709/51 · October/November 2023 · Q2c[3]
3-mark question — its maths and diagrams are best seen on the paper.
See it on the paper → - 9709/63 · October/November 2023 · Q4a[2]
2-mark “Find” question — its maths and diagrams are best seen on the paper.
See it on the paper → - 9709/63 · October/November 2023 · Q4b[6]
6-mark “Find” question — its maths and diagrams are best seen on the paper.
See it on the paper → - 9709/53 · May/June 2023 · Q1a[1]
1-mark “State” question — its maths and diagrams are best seen on the paper.
See it on the paper → - 9709/53 · May/June 2023 · Q3a[4]
4-mark question — its maths and diagrams are best seen on the paper.
See it on the paper → - 9709/53 · May/June 2023 · Q3b[1]
1-mark “Draw” question — its maths and diagrams are best seen on the paper.
See it on the paper → - 9709/53 · May/June 2023 · Q3c[2]
2-mark question — its maths and diagrams are best seen on the paper.
See it on the paper →
What examiners said
This standard binomial distribution question was not attempted by a significant number of candidates. Good solutions stated clearly the required terms and then evaluated accurately without intermediate values being shown. A number of solutions were seen with intermediate values stated to less than 4 significant figures, which produced an inaccurate final probability. Some candidates seemed to work...
— Examiner report, October/November 2023, 9709/51 Q2(c) (Cambridge)
This part referred only to chemical A. The answer for the mean income from A was in dollars. Either 25.75 or 25.8 was accepted.
— Examiner report, October/November 2023, 9709/63 Q4(a) (Cambridge)
In order to compare the incomes from chemical A and chemical B, it was necessary to create a new variable A – B and to find the mean (– 11.3) and variance (137.5056) of this new variable. To find the probability that the income generated by chemical A was greater than the income generated by chemical B, these values could be used to find the probability that A – B > 0. A sketch could be useful to...
— Examiner report, October/November 2023, 9709/63 Q4(b) (Cambridge)
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