passwella.
Menu

WAEC Further Mathematics 2025 Question 24

Question 24

Statistics

The ages (in years) of 10 children in a school are 4, 4.5, 7.8, 9.5, 6, 9, 12.5, 11, 5 and 5.5. Calculate, correct to two decimal places, the mean deviation.

  1. A.2.46
  2. B.2.48
  3. C.2.52
  4. D.2.54
Show the answer and explanation

Answer: B (2.48)

Explanation

Mean = 74.8/10 = 7.48. The absolute deviations add up to 24.8, so the mean deviation = 24.8/10 = 2.48.