Variability (standard deviation)of a population where a mean is being estimated may be estimated by dividing the range by 6.

Name: Variability (standard deviation)of a population where a mean is being estimated may be estimated by dividing the range by 6.
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The range divided by 6 is a rough estimate of the standard deviation for a normal distribution, as the range covers approximately six standard deviations (three on each side of the mean).

Variability (Standard Deviation)of a Population Where a Mean Is Being