Variance

In probability theory and statistics, the variance of a random variable is a measure of its statistical dispersion, indicating how far from the expected value its values typically are.

Related Topics:
Probability theory - Statistics - Random variable - Statistical dispersion - Expected value

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The variance of a real-valued random variable is its second central moment, and it also happens to be its second cumulant. The variance of a random variable is the square of its standard deviation.

Related Topics:
Real - Central moment - Cumulant - Standard deviation

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