Averages & Weighted AveragesHESI A2 cheat sheet

Mean, and when it is weighted

5 key facts Reviewed Oct 2026

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Simple Mean

Add every value, divide by how many

Finding A Missing Value

Multiply the mean by the count to get the total, then subtract what you know

Weighted Average

Multiply each value by its weight, add, then divide by total weight
Course grades and vital-sign trends work this way

Caution

An outlier pulls the mean — the median may describe the data better

Key takeaway

Mean, and when it is weighted

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