Basic StatisticsHESI A2 cheat sheet

Center and spread

7 key facts Reviewed Oct 2026

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Center

Mean — the average
Median — the middle after sorting
Mode — most frequent

Spread

Range — highest minus lowest
Standard deviation — typical distance from the mean

Which To Report

Outliers pull the mean; the median is more representative then

Reading Data

Always check the sample size and the units first

Key takeaway

Center and spread

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