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JAMB 1995 · UME · Q46

The variance of the scores 1, 2, 3, 4, 5 is

Worked solution (try it first)
  1. The mean of 1, 2, 3, 4, 5 is 3.
  2. The squared deviations are 4, 1, 0, 1, 4, which add up to 10.
  3. The variance is 105=2.0\frac{10}{5} = 2.0, option C.

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