# Standard deviation.

`stddev = sqrt`

for the population whose mean is σ.*(sum (abs(x - σ)^2) / N)*

For a sample of the population, Bessel’s Correction reduces bias in the variance: `sqrt`

rW5*(sum (abs(x - sample mean)^2) / (N - 1))*

id: 3301,2C title: Standard deviation. date: 2022-10-23