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JAMB Mathematics 2008 Question 50

Question 50

Probability

The result of rolling a fair die 150 times is summarized in the table below.
Number: 1, 2, 3, 4, 5, 6
Frequency: 12, 18, x, 30, 2x, 45
What is the probability of obtaining a 5?

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

Answer: B (1/5)

Explanation

12 + 18 + x + 30 + 2x + 45 = 150 gives 3x = 45 and x = 15. A 5 came up 2x = 30 times, so P = 30/150 = 1/5.