Variance

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.