For a set of 10 observations the sum of the observations is 60 and the sum of their squares is 1000. Find the variance.

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Accepted Answer

64. Mean = 60 ÷ 10 = 6. Variance = (Σx²)/n − (mean)² = 1000/10 − 6² = 100 − 36 = 64. Subtracting the mean instead of its square would wrongly give 94.

For a set of 10 observations the sum of the observations is 60 and the sum of their squares is 1000. Find the variance.

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