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WAvgLab
Give each value its own weight.
A plain average treats every number the same, but a weighted average lets some values count more — a final exam worth 40% of a grade should influence the result more than a 5%-weighted quiz.
Course grades, portfolio returns weighted by investment size, and survey results weighted by sample representativeness all rely on this same calculation.
Weighted average
84.167
What you entered
Multiply each value by its weight, then sum
90×3 + 80×2 + 75×1= 505Sum the weights
3 + 2 + 1= 6Divide the weighted sum by the total weight
505 ÷ 6= 84.1667Result
Weighted average: 84.167
The weighted average is 84.167 — values with larger weights pull the average more strongly toward themselves than a plain average would.