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WAEC Mathematics 1992 Question 50

Question 50

Probability

The data below shows the number of workers employed in the various sections of a construction company in Lagos.
Carpenters 24, Plumbers 12, Painters 9, Bricklayers 18, Labourers 27, Plasterers 15, Messengers 3
If a worker is retrenched, what is the probability that he is a plumber or plasterer.

  1. A.1/27
  2. B.1/9
  3. C.5/36
  4. D.1/4
  5. E.3/4
Show the answer and explanation

Answer: D (1/4)

Explanation

Plumbers + plasterers = 12 + 15 = 27 out of 108 workers, so the probability is 27/108 = 1/4.