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# In a study of diabetic patients in a village, the following observations were noted.

Represent the above data by a frequency polygon.

Answer :

Let’s take two classes interval, first at beginning (0-10) and second at the end (70-80) each with frequency zero.

Now we can draw the frequency table with the help of these two classes,

Now plot the following points on the graph,

A (5,0)

B (15,2)

C (25, 5)

D (35, 12)

E (45, 19)

F (55, 9)

G (65, 4)

H (75,0)

Join the points with line segments

AB, BC, CD, DE, EF, FG, GH, to obtain required frequency polygon. As shown in the figure.

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A frequency polygon is constructed by lotting frequency of the class interval and the

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