Frequency Polygon

A Frequency Polygon is an alternative to histograms, as it also used in representing the frequency of an event. It is a line graph, joining consecutive points.

Note: If drawn over a Histogram, each point on the frequency polygon is the mid-point of the top of each respective bar.

Example

The table below displays the results of a survey of 70 persons, providing their favourite number from the list 1-9.

Numbers 1 2 3 4 5 6 7 8 9
Frequency 0 5 9 14 20 10 7 5 0

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