The variance is a measure of spread of a set of data that measures how much the data elements deviate from the mean. Mathematically, the variance is the average of the squares of the difference between each data value xi and the mean x.
n(x1−x)2+(x2−x)2+⋯+(xn−x)2
The variance is the square of the standard deviationσ, so it is usually denoted as σ2.
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