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JAMB Mathematics 2003 Question 50

Question 50

Probability

Number: 1, 2, 3, 4, 5, 6
Frequency: 12, 20, x, 21, x − 1, 28
The result of tossing a fair dice 120 times is summarized above. Find the value of x.

  1. A.19
  2. B.20
  3. C.21
  4. D.22
Show the answer and explanation

Answer: B (20)

Explanation

12 + 20 + x + 21 + (x − 1) + 28 = 120, so 80 + 2x = 120 and x = 20.