Q13 of 26 Page 14

Find the mean and variance for the following data: 6, 7, 10, 12, 13, 4, 8, 12


==== 9.

The respective (xi - )2 are 32, 22, 12, 32, 42, 52, 12, 32.

∑ (xi - )2 = 9 + 4 + 1 + 9 + 16 + 25 + 1 + 9 = 74

Hence variance (σ 2) = 74/8 = 9.25

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