Calculate mean for the following data pertaining to marks in Statistical Sampling Theory out of 140 marks for 110 students in a class: Marks 0-20 20-40 40-60 60-80 80-100 100-120 120-140 No. of students 20 26 22 10 9 10 13

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Calculate mean for the following data pertaining to marks in Statistical Sampling Theory out of 140 marks for 110 students in a class:

Marks

0-20

20-40

40-60

60-80

80-100

100-120

120-140

No. of students

20

26

22

10

9

10

13

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