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WAEC Further Mathematics 2010 Question 24

Question 24

Probability

In a class of 50 pupils, 35 like Science and 30 like History. What is the probability of selecting a pupil who likes both Science and History?

  1. A.0.10
  2. B.0.30
  3. C.0.60
  4. D.0.70
Show the answer and explanation

Answer: B (0.30)

Explanation

Assuming every pupil likes at least one subject, both = 35 + 30 − 50 = 15. Probability = 15/50 = 0.30.