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WAEC Mathematics 2026 Question 38

Question 38

Measures of Central Tendency

The sum of the ages of 14 learners in a class is 168. A learner was added to the class and the mean age changed to 12.2. Calculate the age of the new learner.

  1. A.16
  2. B.14
  3. C.15
  4. D.13
Show the answer and explanation

Answer: C (15)

Explanation

15 learners with mean 12.2 have total age 183, so the new learner is 183 − 168 = 15.