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JAMB 2001 · UME · Q45

Find the variance of 2, 6, 8, 6, 2 and 6.

Worked solution (try it first)
  1. The six numbers add up to 30, so the mean is 5.
  2. The squared deviations are 9, 1, 9, 1, 9, 1, which add up to 30.
  3. The variance is 306=5\frac{30}{6} = 5, option C.

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