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JAMB 2014 · UTME · Q47

Find the standard deviation of 5, 4, 3, 2, 1.

Worked solution (try it first)
  1. The mean of 5, 4, 3, 2, 1 is 3.
  2. The squared deviations are 4, 1, 0, 1, 4, which add up to 10.
  3. The variance is 105=2\frac{10}{5} = 2, so the standard deviation is 2\sqrt2, option B.

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