The variance expresses the mean of the squares of the deviations from the mean, also equal to the difference between the mean of the squares of the values of the variable and the square of the mean, according to the König-Huygens theorem.
The standard deviation is the square root of the variance.
The covariance :
In probability theory and in statistics, the covariance between two random variables is a number that quantifies their joint deviations from their respective expectations.
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