Question

Second moment about mean is
Variance

Answer 1

Answer:

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 .