# standard deviation

### noun Statistics.

a measure of dispersion in a frequency distribution, equal to the square root of the mean of the squares of the deviations from the arithmetic mean of the distribution.

## Origin of standard deviation

First recorded in 1920–25

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## standard deviation

### noun

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## standard deviation

### n. *Symbol*

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## standard deviation

[stăn′dərd]

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## standard deviation

## Note

About sixty-eight percent of the data are within one standard deviation of the mean.

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