Statistics

Collecting, showing and making sense of data — averages, charts, and spotting patterns.

Bar Charts, Pie Charts & Pictograms

Read, draw and interpret the most common data charts — bars, pie slices and picture symbols.

Averages & Range (Mean, Median, Mode)

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

Scatter Graphs & Correlation

Plot two variables against each other and describe the relationship — from strong to none.

Histograms with Unequal Intervals

When bar widths differ, frequency density does the work — here's how to read and draw these charts.

Cumulative Frequency & Interquartile Range

Build up a running total of frequencies to find medians, quartiles and spread.