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

To compare dispersion from the mean, calculate how far each value is from its set’s mean. In B, the mean is 2, and the values are each 2 units from it, giving a population variance of 4. The variances for A, C, and D are 8.75, 6, and 3, respectively—so actually D is the least dispersed, with values 6, 2, 2, 2 and mean 3; its variance is 3. Therefore, the correct choice is D, “6, 2, 2, 2.”

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