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how to draw frequency polygon?
A frequency polygon is another way to show the information in a frequency table.  It looks a little bit like a line graph.  To make a frequency polygon, you just need to plot a few points and then join the points by straightlines.
The midpoint of a class is the point in the middle of the class.  So for instance, if I have a class “10 – 19”, then the midpoint is 14.5.  A class of “0 – 5” has a midpoint of 2.5.


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