The probabilities that John and Jane will pass an examination are 0.9 and 0.7 respectively....

WAEC 2019

The probabilities that John and Jane will pass an examination are 0.9 and 0.7 respectively. Find the probability that at least one of them will pass the examination.

A. 0.28
B. 0.67
C. 0.72
D. 0.97

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Correct Answer: Option D

Explanation

(0.9 x 0.7) + (0.1 x 0.7)

= (0.9 x 0.3)

= 0.63 + 0.07 + 0.27

= 0.97

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The probabilities that John and Jane will pass an examination are 0.9 and 0.7 respectively....

Correct Answer: Option D

Explanation

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