Arithmetic mean of the squares of the deviations of a statistical variable in relationship the arithmetic mean of the distribution.

### Formulas

- In the case of an entire population, the variance is obtained by applying this formula:

\(\dfrac {\sum \left( x_{i}-\mu \right) ^{2}} {N}\)

In which*μ*represents the arithmetic mean of the distribution and \(N\) represents the number of data in this population. - In the case of a sample of this distribution, the variance is obtained by applying this formula:

\(\dfrac {\sum \left( x_{i}-\overline {x}\right) ^{2}} {n-1}\)In which \(\overline {x}\) represents the mean of the data in the sample and \(n\) represents the number of data considered.