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WAEC Further Mathematics 2017 Question 31

Question 31

Probability

The table shows the results of tossing a fair die 150 times.
Face: 1, 2, 3, 4, 5, 6
Frequency: 12, 18, y, 30, 2y, 45
Find the probability of obtaining a 5.

  1. A.1/10
  2. B.1/6
  3. C.1/5
  4. D.3/10
Show the answer and explanation

Answer: C (1/5)

Explanation

105 + 3y = 150 gives y = 15, so a 5 came up 2y = 30 times. P = 30/150 = 1/5.