Free practice · numeric · medium
Practice
Calculate a fictional proportional share
A USD 600 fictional budget is allocated in the ratio 2:3:5. What is the middle share 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.