Frequency Polygons

Frequency polygons show the same information as bar charts, with points joined by lines instead of with vertical bars. Suppose we need to draw a frequency polygon for the data in the table below which contains information about the weights of some ambitious slimmers.

Weight,in kg

Frequency

12

35

76

80

41

17

The frequency polygon is:

Notice that the points are plotted as (midpoint of weight interval, frequency).

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