Probability Trees

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Question 31
Hard

Ahmed is going to sit a Biology exam and a Chemistry exam.

The probability he will pass the Biology exam is 0.9.

The probability he will pass the Chemistry exam is 0.7.

a.

Complete the probability tree diagram.

A probability tree diagram for Biology and Chemistry outcomes.

[2]
b.

Work out the probability that Ahmed will pass both exams.

[2]

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