Question

The marks scored by 750 students in an examination are given in the form of a frequency distribution table:

Marks	No. of student	Marks	No. of students
600−640 640−680 680−720 720−760	16 45 156 284	760−800 800−840 840−880	172 59 18

Prepare a cumulative frequency table by less than method and draw an ogive.

Answer 1

Marks	No. of students	Marks less then	Cumulative frequency	Suitable Points
600-640	16	640	16	(640,16)
640-680	45	680	61	(680,61)
680-720	156	720	217	( 720, 217)
720-760	284	470	501	(760, 501)
760-800	172	800	673	( 800, 673)
800-840	59	840	732	( 840,732)
840-880	18	880	750	( 880,750)

Now, we draw the less than ogive with suitable points.