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WAEC Further Mathematics 2015 Question 27

Question 27

Probability

Each of the 90 students in a class speak at least Igbo and Hausa. If 56 students speak Igbo and 50 speak Hausa, find the probability that a student selected at random from the class speaks Igbo only.

  1. A.28/45
  2. B.4/9
  3. C.8/45
  4. D.1/9
Show the answer and explanation

Answer: B (4/9)

Explanation

Both languages: 56 + 50 − 90 = 16, so Igbo only = 40. P = 40/90 = 4/9.