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Practice

Choose a weighted-average setup

Which setup finds the average price across 10 units at USD 8 and 30 units at USD 12?

Combination math map

Use equal weights only when the observations are equally weighted

Simple mean

NumeratorSum of values
DenominatorEqual count

Weighted mean

NumeratorΣ value × weight
DenominatorΣ weights

Allocation

ShareWhole × part/total
CheckParts + remainder

Weighted means preserve quantities, proportional allocations preserve shares, and a remainder check reconnects every part to the original whole.

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