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JAMB Mathematics 1994 Question 49

Question 49

Probability

Age in years: 10, 11, 12
Number of pupils: 6, 27, 7
The table above shows the number of pupils in each group in a class. What is the probability that a pupil chosen at random is at least 11 years old?

  1. A.27/40
  2. B.17/20
  3. C.33/40
  4. D.3/20
Show the answer and explanation

Answer: B (17/20)

Explanation

There are 40 pupils, and 27 + 7 = 34 are 11 or older. Probability = 34/40 = 17/20.