Question

Determine mean of the following data
Marks No. Of Students
Below 10. 5
Below 20. 9
Below 30. 17
Below 40. 29
Below 50. 50

Answer 1

Answer:

Answer:- Taking continuous class interval with width =10

∴ For "90−100"=Below 100−Below 90=85−83=2

∴ For "80−90"=Below 90−Below 80=83−78=5

Similarly for other classes also.

Thus our frequency distribution table is

Marks Students

f

i

x

i

=

2

lower limit + upper limit

f

i

x

i

0-10 5 5 25

10-20 4 15 60

20-30 8 25 200

30-40 12 35 420

40-50 16 45 720

50-60 15 55 825

60-70 10 65 650

70-80 8 75 600

80-90 5 85 425

90-100 2 95 190

Σf

i

=85 Σf

i

x

i

=4115

∴ Mean =48.4

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