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The following distribution gives the daily income of 50 workers of a factory.
Daily income in Rupees 100-120 120-140 140-160 160-180 180-200
Number of workers 12 14 8 6 10
Convert the distribution above to a less than type cumulative frequency distribution and draw its ogive.


Answer :

Daily income Frequency Cumulative Frequency
Less than 120 12 12
Less than 140 14 26
Less than 160 8 34
Less than 180 6 40
Less than 200 10 50

From the table plot the points corresponding to the ordered pairs such as (120, 12), (140, 26), (160, 34), (180, 40) and (200, 50) on graph paper and the plotted points are joined to get a smooth curve and the obtained curve is known as less than type ogive curve


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