Averages & Range (Mean, Median, Mode)

The three averages and the range — what they each tell you and when to use them.

Mean from a Frequency Table

How to calculate the mean when data is given as a frequency table — including grouped data with midpoints — with clear worked examples.

Mean, Median and Mode

The three averages explained clearly — what each one measures, how to calculate it, and when each is most useful.

Range and Spread

What the range tells you about how spread out data is, how to calculate it, and why it matters when comparing two data sets.