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Following table shows number of students...

Following table shows number of students of a college corresponding to different range of marks in Statistics.Make a frequency polygon.

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A frequency polygon of the above data is presented in the following graph. In this graph, data have been first presented in the form of a histogram. Mid-points of the tops of rectangles in the histogram have been marked and then joined using scale or foot rule. The endpoints of the polygon be joined to the immediate lower or higher mid-points (as the case may be) at zero frequency with the base-line. It is done to equate the area of polygon with the area of histogram. Here is an illustration of constructing a frequency polygon by making a histogram.
Frequency polygon can also be constructed without the help of histogram. Under this method, mid-points of various class intervals are taken and the corresponding frequencies to each mid-points are plotted. We can present the following data in the form of a frequency polygon without constructing a histogram.
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