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Practice
Complete a weighted-average mastery check
A fictional mix has 40 units at USD 5 and 60 units at USD 9. What is the weighted average price in USD?
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.