### 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 |