Second moment about mean is
Variance
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The 2nd moment around the mean = Σ(xi – μx)2. The second is the variance. In practice, only the first two moments are ever used in statistics.
The second moment of a random variable is its mean-squared value (which is the mean of its square, not the square of its mean). A central moment of a random variable is the moment of that random variable after its expected value is subtracted. The variance of X can also be written as Var X .
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