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4.4 Probability (A-level only)

4.4 Probability (A-level only)

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Question 3

The events A A\,A and B B\,B are such that P(A)=0.45P(A) = 0.45P(A)=0.45, P(B∣A)=13P(B \mid A) = \dfrac{1}{3}P(B∣A)=31​ and P(A∣B)=0.3P(A \mid B) = 0.3P(A∣B)=0.3.

a.

Find P(A∩B)P(A \cap B)P(A∩B).

[2]
b.

Find P(B)P(B)P(B).

[2]
c.

Find P(A′∣B′)P(A' \mid B')P(A′∣B′).

[3]
Markscheme

4.4 Probability (A-level only) Questions

  1. A Level
  2. /Maths
  3. /4.4 Probability (A-level only)

164 exam-style questions on CCEA A Level Maths 4.4 Probability (A-level only), covering 4.4.1 Probability (A-level only), 4.4.2 Probability (A-level only), and 4.4.3 Probability (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

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