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Class Interval 0 - 10 10 - 20 20 - 30 30 - 40 40 - 50 50 -60 60 - 70
Frequency 5 15 20 23 17 11 9

Solution:

From the given table, we prepare the 'more than' series as shown below:
Class Frequency Class Interval Cumulative Points to be
Interval Frequency plotted
0-10 5 More than 0 100 (0,100)
10-20 15 10 or More than 95 (10,95)
10
20-30 20 20 or More than 80 (20,80)
20
30-40 23 30 or More than 60 (30,60)
30
40-50 17 40 or More than 37 (40,37)
40
50-60 11 50 or More than 20 (50,20)
50
60-70 9 60 or More than 9 (60,9)
60
Graph work-Graph sheet should be used.

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