Mean, Median, Mode & RangeATI TEAS 7 cheat sheet

Four different 'middles'

9 key facts 5 practice questions Reviewed Oct 2026

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Definitions

Mean — add them all, divide by how many
Median — the middle value after sorting
Mode — the value that appears most often
Range — highest minus lowest

Median Detail

Sort first — always
Even count → average the two middle values

Which To Use

Outliers pull the mean; the median resists them
Median is the better 'typical' value for skewed data such as income

No Mode

If every value appears once there is no mode; there can be more than one

Key takeaway

Four different 'middles'

Before you read

Test yourself first: 5 questions

Question 1 of 5

What is the mean of 10, 20, and 30?

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