Cambridge IGCSE Statistics practice

Paper 1 structured question: Probability

Try the question first, then check the answer and practise the same topic again.

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Paper

Marks

Topic

Probability

Exam-style question

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Paper 1Statistical Techniques2 marks

A box contains 5 green and 3 yellow marbles.

Description

A box contains 5 green and 3 yellow marbles. Two marbles are drawn one after the other without replacement.

a
Calculate the probability of drawing a green marble first.
Your answer
Aim for approximately 1 distinct marking point.
[1]
b
Calculate the probability of drawing a yellow marble second, given that the first marble drawn was green.
Your answer
Aim for approximately 1 distinct marking point.
[1]

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Paper 1Statistical Techniques2 marks

Description

A bag contains 4 red balls and 6 blue balls. A ball is drawn at random, noted, and then replaced. Another ball is drawn.

a
Calculate the probability of drawing a red ball on the first draw.
Your answer
Aim for approximately 1 distinct marking point.
[1]
b
Calculate the probability of drawing a blue ball on the second draw, given that the first ball drawn was red and replaced.
Your answer
Aim for approximately 1 distinct marking point.
[1]