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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.

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Solution

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.


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