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Table 3 The best estimating formula for an unknown distribution.

From: Estimating the mean and variance from the median, range, and the size of a sample

Sample Size: n ≤ 15 15 <n ≤ 25 25 <n ≤ 70 70 <n
Estimate Mean Formula (5) Median
Estimate Standard Deviation Formula (16) Range/4 Range/6
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