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Unilorin Post-UTME Mathematics 2015 (Model questions) Question 30

Question 30

Measures of Central Tendency

The average of the three children in a family is 9 years. If the average age of their parent is 39 years, what is the average age of the whole family?

  1. A.20 years
  2. B.27 years
  3. C.24 years
  4. D.21 years.
Show the answer and explanation

Answer: D (21 years.)

Explanation

Children total 27 years and parents 78 years, so the 5 members average 105 ÷ 5 = 21 years.