Variance and coefficient of variation

Variance is a measure of how spread out the values in a data set are around the mean. It is calculated by finding the average of the squared differences from the mean. Mathematically, for a set of values x1,x2,…,xnx_1, x_2, \ldots, _________ ________ _____ ________ ______ _____ ______ ____ __________.
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