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WAEC Mathematics 2018 Question 45

Question 45

Measures of Dispersion

Find the mean deviation of 20, 30, 25, 40, 35, 50, 45, 40, 20 and 45.

  1. A.8
  2. B.9
  3. C.10
  4. D.12
Show the answer and explanation

Answer: B (9)

Explanation

Mean = 350/10 = 35. The distances from 35 add to 15 + 5 + 10 + 5 + 0 + 15 + 10 + 5 + 15 + 10 = 90, so the mean deviation is 9.