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WAEC Further Mathematics 2019 Question 37

Question 37

Probability

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.

  1. A.0.28
  2. B.0.67
  3. C.0.72
  4. D.0.97
Show the answer and explanation

Answer: D (0.97)

Explanation

P(neither) = 0.1 × 0.3 = 0.03, so P(at least one) = 0.97.