Name this quantity, the average of the squares of the deviations, whose square root equals the standard deviation.
The square of this quantity is used in the denominator of classical calculations of kurtosis, which is supposed to measure the peakedness of a distribution, and this quantity is known as the second moment about the mean. In a Poisson (pwah-SOHN) distribution, this quantity is equal to the mean. For a set of numbers, this quantity is equal to the expected value of the squares of the numbers minus the square of the expected values. If all of the numbers in a list are multiplied by a constant, this quantity gets multiplied by that factor squared. Name this quantity, the average of the squares of the deviations, whose square root equals the standard deviation.
The square of this quantity is used in the denominator of classical calculations of kurtosis, which is supposed to measure the peakedness of a distribution, and this quantity is known as the second moment about the mean.
sample variance [accept second moment or second cumulant before “moment”; do not accept or prompt on word forms]