Standard deviation

Computes the standard deviation of a data sample $X=\{x_1,...,x_n\}$

$s^2=\frac{1}{n-1}\sum _{i=1}^n(x_i-\overline{x}{)}^2$

where $\overline{x}$ is the mean of $X$.

standard_deviation(Statistics_data)

Description

Given a data sample $X$, computes its standard deviation.