Answer :

Less than method:

Now on x-axis upper class limits and on y-axis cumulative frequency, we plot the points: (55,2); (60,10) ;(65,22); (70,46); (75,84); (80,100)

More than method:

Now, Mark on x-axis lower class limit and on y-axis cumulative frequency. We plot the points: (50,100); (55,98); (60,90); (65,78); (70,54); (75,16)

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