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2.3.10 Conditional probabilities (A-level only)

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Question 9

Events A A\,A and B B\,B satisfy P(A)=320\displaystyle P(A)=\frac3{20}P(A)=203​, P(A∩B)=120\displaystyle P(A\cap B)=\frac1{20}P(A∩B)=201​ and P(A∣B)=514\displaystyle P(A\mid B)=\frac5{14}P(A∣B)=145​.

a.

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

[3]
b.

Find P(A∪B)P(A\cup B)P(A∪B).

[3]
c.

Find P(B∣A′)P(B\mid A')P(B∣A′).

[3]
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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