Standard Deviation Logo. In statistics and probability theory. Covariance of random variables x and y.
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Correlation of random variables x and y. Standard deviation is a measure of how far away individual measurements tend to be from the mean value of a data set. In statistics and probability theory.
A low standard deviation means that most of the numbers are close to the average while a high standard deviation means that the numbers are more spread out.
Standard deviation of random variable x. For other uses of the symbol σ in science and mathematics see sigma science and mathematics. Standard deviation is a number used to tell how measurements for a group are spread out from the average mean or expected value. Covariance of random variables x and y.
