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4.1 Probability (A-level only)

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Question 1

A jar contains 7 yellow marbles, 5 purple marbles, and 8 green marbles. Two marbles are selected at random from the jar without replacement.

a.

Draw a tree diagram to represent this information.

[3]
b.

Find the probability that both marbles selected are purple.

[2]
c.

Given that at least one of the marbles selected is yellow, find the probability that both marbles are yellow.

[3]
Markscheme

4.1 Probability (A-level only) Questions

  1. A Level
  2. /Maths
  3. /4.1 Probability (A-level only)

164 exam-style questions on WJEC A Level Maths 4.1 Probability (A-level only), covering 4.1.1 Probability (A-level only), 4.1.2 Probability (A-level only), and 4.1.3 Probability (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

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