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Unilorin Post-UTME Mathematics 2018 (Model questions) Question 42

Question 42

Measures of Central Tendency

The average age of X pupil in a class is 14 years 2 months. A pupil of 15 years 2 months joins the class and the average age is increased by one month. Find X

  1. A.12
  2. B.6
  3. C.11
  4. D.14
Show the answer and explanation

Answer: C (11)

Explanation

In months: 170X + 182 = 171(X + 1), so X = 182 − 171 = 11.