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JAMB Mathematics 2017 Question 4

Question 4

Measures of Dispersion

Calculate the mean deviation of the sets of numbers 7, 3, 14, 9, 7 and 8.

  1. A.2 1/6
  2. B.2 1/2
  3. C.1 1/6
  4. D.2 1/3
Show the answer and explanation

Answer: D (2 1/3)

Explanation

Mean = 48/6 = 8. The distances from 8 are 1, 5, 6, 1, 1, 0, which add to 14. Mean deviation = 14/6 = 2⅓.