Save guides, add subjects and pick up where you left off with your BBC account. Stem and leaf diagrams are formed by splitting the number into two parts, the ‘stem’ and the ‘leaf.

The key compares how a number is shown in the diagram to how it would normally be written. \(6\) people had a score of more than \(40\). To find this, look down the stem to the row labelled \('4'\).