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Standard deviation

noun

Definitions

Noun
  1. 1
    A measure of how spread out data values are around the mean, defined as the square root of the variance. Represented with the Greek letter σ (sigma).
  2. 2
    the square root of the variance wordnet

Etymology

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

See also for "standard deviation"

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