View source for Weighted average

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The quantity

$$ 
\overline{x}\;  = \ 

\frac{\sum _ {i = 1 }   ^ {n} p _ {i} x _ {i} }{\sum _ {i = 1 }   ^ {n} p _ {i} }
 ,
$$

where  $  x _ {1} \dots x _ {n} $
are  $  n $
quantities taken with respective weights  $  p _ {1} \dots p _ {n} $.