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2.3 Probability

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Question 18

The events A and B are such that P(A)=516\displaystyle P(A) = \frac{5}{16}P(A)=165​, P(B)=12\displaystyle P(B) = \frac{1}{2}P(B)=21​ and P(A∣B)=14\displaystyle P(A|B) = \frac{1}{4}P(A∣B)=41​. Find

a.

P(A∩B)P(A \cap B)P(A∩B)

[2]
b.

P(B′∣A)P(B'|A)P(B′∣A)

[3]
c.

P(A′∪B)P(A' \cup B)P(A′∪B)

[2]
d.

Determine whether the events A and B are independent, give a reason for your answer.

[3]

2.3 Probability Questions

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