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WAEC 2023 · Paper 1 · Q25

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

Worked solution (try it first)
  1. The numbers add up to 99, so the mean is 996=16.5\frac{99}{6} = 16.5.
  2. The distances from 16.5 are 2.5, 1.5, 0.5, 0.5, 1.5 and 2.5, which add up to 9.
  3. The mean deviation is 96=1.5\frac96 = 1.5, option B.

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