Expectation operator = E[]

@wikipedia

Statistical metric characterizing the expected value of a given numerical dataset $\begin{array}{l}x = \{ x_1, \, x_2, \, x_3 , ... x_N \}\end{array}$ :

$\begin{array}{l}\displaystyle E[x] = \frac{1}{N} \sum_{i=1}^N x_i\end{array}$

where

$\begin{array}{l}N\end{array}$

dataset length

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Expectation operator = E[]