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WAEC Mathematics 2023 Question 25

Question 25

Measures of Dispersion

Find the mean deviation of the set of numbers: 14, 15, 16, 17, 18 and 19.

  1. A.1.7
  2. B.1.5
  3. C.2.5
  4. D.3.5
Show the answer and explanation

Answer: B (1.5)

Explanation

The mean is 99/6 = 16.5. The distances from the mean are 2.5, 1.5, 0.5, 0.5, 1.5, 2.5, which add to 9, and 9 ÷ 6 = 1.5.