Frequency Polygons are graphs that are constructed out of a frequency table. To create a Frequency Polygon just follow these steps:
1) Create a histogram
2) Plot the midpoints for each bar on the histogram
3) Plot a point with a value of zero one bar below the smallest class. Also plot a point with a value of zero one bar above the largest class
4) Connect all the data point with a straight line
Constructing a Frequency Polygon from a Frequency Distribution
The following frequency table shows the amount of time it took 45 ski racers to complete a ski course:
Interpreting a Frequency Polygon
The frequency polygon below shows the wind speed during a particular day in San Francisco Bay:
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