Grouped data are also represented by frequency polygons. A frequency polygon is a polygon whose vertices are at the midpoint of the tops of rectangles forming the histogram of the frequency distribution. These middle points correspond to the class marks of the corresponding class intervals.
Methods of constructing a frequency polygon:
There are two methods of constructing a frequency polygon for a classified data:
I. with the help of a histogram, and
II. with the help of class marks.
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