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standard deviation: Meaning and Definition of

stand'ard devia'tion

Pronunciation: [key]
— Statistics. Statistics.
  1. 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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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