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Question
Draw a histogram and a frequency polygon for the following data:
| Wages | 150 - 200 | 200 - 250 | 250 - 300 | 300 - 350 | 350 - 400 | 400 - 450 |
| No. of workers | 25 | 40 | 35 | 28 | 30 | 22 |
Solution
We represent the class limits on the x-axis on a suitable scale and the frequencies on the y-axis on a suitable scale. Taking class intervals as bases and the corresponding frequencies as heights, we construct rectangles to obtain a histogram of the given frequency distribution.
Now, we take the mid-point of the upper horizontal side of each rectangle. Join the mid-points of two imaginary class intervals, one on either side of the histogram, by line segments one after the other.
Here as the class limits do not start from 0, we put a kink between 0 and the lower boundary of the first class.
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