Bitesize has changed! We're updating subjects as fast as we can. Visit our new site to find Bitesize guides and clips - and tell us what you think!


Line graphs, frequency polygons and stem and leaf diagrams

Stem and leaf diagrams

A maths test is marked out of 50. The marks for the class are shown below:

  • 7, 36, 41, 39, 27, 21
  • 24, 17, 24, 31, 17, 13
  • 31, 19, 8, 10, 14, 45
  • 49, 50, 45, 32, 25, 17
  • 46, 36, 23, 18, 12, 6

This data can be more easily interpreted if we represent it in a stem and leaf diagram.

This stem and leaf diagram shows the data above:

The stem and leaf diagram is formed by splitting the numbers into two parts - in this case, tens and units.

The tens form the 'stem' and the units form the 'leaves'.

This information is given to us in the Key.

It is usual for the numbers to be ordered. So, for example, the row

image: 2 | 1 3 4 4 5 7

shows the numbers 21, 23, 24, 24, 25 and 27 in order.


From the stem and leaf diagram how many children scored more than 40?

toggle answer


6 people had a score of more than 40

To find this look down the "stem" to the the column labelled 4, and don't forget to include the child who scored 50!

Back to Statistics and probability index

BBC © 2014 The BBC is not responsible for the content of external sites. Read more.

This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.