Wikipedia 10K Redux by Reagle from Starling archive. Bugs abound!!!

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Weighted_Mean

back to [[Summary Statistics]] -- [[Central Tendency]]

Given a set of data, X={x1, x2, ..., xn} and corresponding weights, W={w1, w2, ..., wn} the weighted mean is calculated as

*Weighted mean = ( w1x1 + w2x2 + ... + wnxn ) / ( w1 + w2 + ... + wn )

Note that if all the weights are equal, the weighted mean is the same as the [[Arithmetic Mean]].
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[[Dick Beldin]]