The central value of a discrete set of numbers in a given data set $\begin{array}{l}x\end{array}$ :

$\begin{array}{l}\displaystyle \bar x = \frac{1}{n} \sum_{i=1}^n x_i\end{array}$

where

$\begin{array}{l}x\end{array}$	a variable represented by data set
$\begin{array}{l}\{ x_1, \, x_2, \, x_3 , ... x_N \}\end{array}$	discrete set of numerical samples of variable $\begin{array}{l}x\end{array}$

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See also