Arithmetic mean

Arithmetic mean:

(1)
\begin{align} \bar X = \frac{{\sum\nolimits_{j = 1}^N {{X_j}} }}{N} \end{align}

Weighted arithmetic mean:

(2)
\begin{align} \bar X = \frac{{\sum\nolimits_{j = 1}^N {{w_j}{X_j}} }}{{\sum\nolimits_{j = 1}^N {{w_j}} }} \end{align}
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