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Representing data


Frequency diagrams and polygons

This frequency diagram shows the heights of 200 people:

Frequency diagram

You can construct a frequency polygon by joining the midpoints of the tops of the bars.

Frequency polygons are particularly useful for comparing different sets of data on the same diagram.

Constructing a frequency polygon

Frequency polygon

Diagram showing data


Representing data activity

Fancy some pie? Try this activity.



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