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Wed, 06 May 2026 17:27:58 +0000

Standard deviation may be abbreviated SD or std dev, and is most commonly represented in mathematical texts and equations by the lowercase Greek letter (sigma). Standard deviation is a statistical measure that shows how much a group of data is spread out or dispersed from its mean value (average). A smaller standard deviation value indicates that the. This free standard deviation calculator computes the standard deviation, variance, mean, sum, and error margin of a given data set. Deviation means how far from the normal. The Standard Deviation is a measure of how spread out numbers are. Its symbol is (the greek letter sigma).