## Variance and Standard & Mean DeviationThe variance of a real-valued random variable is its second central moment, and it also happens to be its second cumulant. In statistics, standard deviation is a simple measure of the variability or dispersion of a population, a data set, or a probability distribution. A low standard deviation indicates that the data points tend to be very close to the same value (the mean), while high standard deviation indicates that the data are “spread out” over a large range of values. - Wikipedia
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