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Conditional Probability

Conditional Probability

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Question 201

The events A and B are such that P(A)=0.3P(A) = 0.3P(A)=0.3 and P(A∪B)=0.7P(A \cup B) = 0.7P(A∪B)=0.7.

a.

Verify that P(A′∩B′)=0.3P(A' \cap B') = 0.3P(A′∩B′)=0.3

[2]
b.

Verify that P(A′∩B)=0.4P(A' \cap B) = 0.4P(A′∩B)=0.4

[2]
c.

Given also that the events A and B are independent, verify that P(B)=4/7P(B) = 4/7P(B)=4/7

[4]
d.

Verify that P(A′∪B′)=29/35P(A' \cup B') = 29/35P(A′∪B′)=29/35

[2]
Markscheme

Conditional Probability Questions

  1. A Level
  2. /Maths
  3. /Conditional Probability

368 exam-style questions on Edexcel A Level Maths Conditional Probability, covering 2.1 Set Notation, 2.2 Conditional Probability, 2.3 Conditional Probabilities in Venn Diagrams, 2.4 Probability Formulae, and 2.5 Tree Diagrams. Each one has a worked solution and a mark scheme showing where the marks go.

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