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Maths

Line graphs, frequency polygons and stem and leaf diagrams

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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

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

Question

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

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!

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