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Computing (FOLDOC) dictionary (also found in English - English (Wordnet), )
standard deviation
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statistics (SD) A measure of the range of values in a set of
numbers. Standard deviation is a statistic used as a measure
of the dispersion or variation in a distribution, equal to the
square root of the arithmetic mean of the squares of the
deviations from the arithmetic mean.
The standard deviation of a random variable or list of numbers
(the lowercase greek sigma) is the square of the variance.
The standard deviation of the list x1, x2, x3...xn is given by
the formula: