Compute and explain a weighted average.
Weighted Average Without the Trap Weighted mean = sum(value x weight) / sum(weight). The shortcut is to report the first tidy number and skip the unit, denominator, or uncertainty that makes the calculation meaningful. Step 1 Name the unit of analysis and write the raw quantities. This prevents mixing customers, accounts, tickets, and percentages as if they were interchangeable. Step 2 Apply the formula using the correct denominator or comparison. Most workplace statistics errors are denominator errors disguised as insight. Step 3 Compare the result with the decision threshold and uncertainty. The calculation becomes useful only when it changes or…
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