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WAEC Mathematics 2008 Question 50

Question 50

Measures of Dispersion

Find the mean deviation of these numbers: 10, 12, 14, 15, 17, 19.

  1. A.2.5
  2. B.2.6
  3. C.2.7
  4. D.2.8
Show the answer and explanation

Answer: A (2.5)

Explanation

Mean = 87/6 = 14.5. Absolute deviations: 4.5, 2.5, 0.5, 0.5, 2.5, 4.5, total 15. Mean deviation = 15/6 = 2.5.