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2.3.10 Conditional probabilities (A-level only)

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Question 59

Events A A\,A and B B\,B satisfy P(A)=0.6P(A)=0.6P(A)=0.6, P(B∣A)=0.35P(B\mid A)=0.35P(B∣A)=0.35 and P(B∣A′)=0.35P(B\mid A')=0.35P(B∣A′)=0.35.

a.

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

[3]
b.

Show that A A\,A and B B\,B are independent.

[2]
c.

Find P(A∪B)P(A\cup B)P(A∪B).

[3]
d.

Find P(A′∣B′)P(A'\mid B')P(A′∣B′).

[2]
Markscheme

2.3.10 Conditional probabilities (A-level only) Questions

  1. A Level
  2. /Maths
  3. /2.3.10 Conditional probabilities (A-level only)

164 exam-style questions on OCR (MEI) A Level Maths 2.3.10 Conditional probabilities (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

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