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Question

Draw a frequency polygon from the following data by using (i) histogram, and (ii) without using histogram:
Daily Wages (in ₹) 10−15 15−20 20−25 25−30 30−35
Number of Workers 40 70 60 80 60


Solution

Using a histogram, a frequency polygon is obtained by joining the top mid-points of the rectangles of the histogram.


When frequency polygon is to be drawn without a histogram then, we simply plot the mid-points of the class intervals with their respective frequencies. The curve obtained on joining the points is the frequency polygon.
 
Daily Wages Mid Point No. of Workers
10 − 15 10+152=12.5 40
15 − 20 10+152=17.5 70
20 − 25 10+152=22.5 60
25 − 30 10+152=27.5 80
30 − 35 10+152=32.5 60
 

Economics
TR Jain (2018)
Standard XI

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