How many Discrete random variables questions are there for 9709?

This page collects 12 recent Cambridge Mathematics (9709) past-paper questions tagged to Discrete random variables. Each links straight to instant marking against the official 9709 scheme.

How are Discrete random variables answers marked?

Type or photograph your working and MarkScheme scores it against the real 9709 mark scheme for this topic — method, accuracy and any band descriptors — so you see exactly where the marks are.

Where can I learn Discrete random variables first?

Start with the free Mathematics lesson on Discrete random variables, then come back and drill past-paper questions under timed conditions.

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9709 · topic questions

Discrete random variables

Mathematics12 questions

12 past-paper questions on Discrete random variables

9709/61 · May/June 20245 marks
Every July, as part of a research project, Rita collects data about sightings of a particular kind of bird. Each day in July she…
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9709/62 · May/June 20244 marks
Given that the team scores a total of 5 goals in a randomly chosen match, find the probability that they score exactly 3 goals in…
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9709/51 · May/June 20244 marks
Draw up the probability distribution table for X.
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9709/51 · May/June 20254 marks
Draw up the probability distribution table for X.
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9709/52 · May/June 20253 marks
10 adult kestrels are selected at random. Find the probability that fewer than 3 have masses greater than 0.202kg.
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9709/62 · May/June 20253 marks
It is given that P(X = n) = P(X = n+1). Write down an equation in n, and hence find the value of n.
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9709/62 · May/June 20253 marks
Two values of W are chosen at random. Find the probability that the sum of these two values is less than 3.
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9709/52 · May/June 20243 marks
Draw up the probability distribution table for X.
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9709/51 · May/June 20253 marks
9 competitors who took part in this Saturday's event are selected at random. Find the probability that at least 2 and fewer than…
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9709/52 · October/November 20243 marks
Find the probability that Leno scores his second goal on or before his 5th attempt.
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9709/52 · May/June 20243 marks
For a random sample of 10 residents of Mahjing, find the probability that fewer than 8 classified their bus service as good or…
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9709/52 · October/November 20243 marks
Find the probability that she succeeds on fewer than 3 of these shots.
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Question stems are shortened previews. Open a question to attempt the full version and have it marked.

Worked example

What a lost mark actually looks like

This answer reaches the right coordinates and still drops a mark — the conclusion is stated, but never justified. Examiners pay for the reasoning, not the answer.

MARKED

80%

Strong

M1dy/dx = 3x^2 - 12x + 9M1 earned
M1(x - 1) $(x - 3) = 0$ M1 earned
A1 $x = 1$ or $x = 3$ A1 earned
B1(1, 5) is a maximum and (3, 1) is a minimumB1 not earned

B1 — withheld
You stated the nature of each point correctly, but stated it without justification. This mark needs the reasoning shown — either evaluate the second derivative (d²y/dx² = 6x − 12, giving −6 at $x = 1$ and +6 at $x = 3$ ) or show a sign change of dy/dx either side of each point. An unsupported assertion earns nothing here even when the conclusion is right.

Discrete random variables (9709) past-paper questions — marked instantly

These are real Cambridge Mathematics past-paper questions on Discrete random variables. Open one, attempt it, then upload your working — MarkScheme grades it against the official 9709 mark scheme so you see exactly where the marks are won and lost on this topic.

Mark your answer →Learn Discrete random variables 9709 grade boundaries

Frequently asked questions

How many Discrete random variables questions are there for 9709?: This page collects 12 recent Cambridge Mathematics (9709) past-paper questions tagged to Discrete random variables. Each links straight to instant marking against the official 9709 scheme.
How are Discrete random variables answers marked?: Type or photograph your working and MarkScheme scores it against the real 9709 mark scheme for this topic — method, accuracy and any band descriptors — so you see exactly where the marks are.
Where can I learn Discrete random variables first?: Start with the free Mathematics lesson on Discrete random variables, then come back and drill past-paper questions under timed conditions.