# Standard Deviation Definition

stăndərd

noun

A measure of variability equal to the square root of the arithmetic average of the squares of the deviations from the mean in a frequency distribution.

Webster's New World

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## Other Word Forms of Standard Deviation

### Noun

Singular:

standard deviation
Plural:

standard-deviations## Origin of Standard Deviation

Coined by English mathematician Karl Pearson in 1894 in his paper "On the dissection of asymmetrical frequency curves".

From Wiktionary

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