Which data set is the most clustered around its mean?

Each data set has a mean of 7. To compare how tightly the values cluster around the mean, compare their squared deviations from 7: A has a total of 20, while B, C, and D have totals of 74, 46, and 50. Since A has the smallest deviations overall, 4, 10, 8, 6 is the most clustered around its mean.

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