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A weighted mean (or weighted average) is like an ordinary mean, but the observations don't contribute equally - more emphasis is placed on some data values than others; they are weighted by a bigger or smaller amount than 1/n.
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Interpretation of sum of squares divided by sim
For the collection of numbers $S=\{x_1,x_2,...,x_n\}$ consider the term,
$T_S =({\sum_{i=1}^n x_i^2})/({\sum_{i=1}^n x_i})$
where $\forall i, x_i \in [0,1]$ . Is there any specific name for this te …