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Range Rule of Thumb

Author: Ryan Backman

Terms to Know

Range "Rule of Thumb": In a set of data, the standard deviation is approximately one-fourth the difference between the largest and smallest number in the data set. This rule of thumb is more accurate for larger samples with distributions that are approximately symmetric.

Formulas to Know

Range "Rule of Thumb"

$r a n g e space almost equal to space 4 times s tan d a r d space d e v i a t i o n$

$s tan d a r d space d e v i a t i o n space almost equal to space fraction numerator r a n g e over denominator 4 end fraction$