Which set of population data is the least dispersed from its mean?

Compare how far each set’s values are from its mean. For C, the mean is 3, and the deviations are 3, −1, −1, and −1, giving a population variance of (9 + 1 + 1 + 1) ÷ 4 = 3. The other sets have larger population variances: A and D each have 6.75, while B has 4. Therefore, C, 6, 2, 2, 2, is the least dispersed from its mean.

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