Question

find the mean mark of the following data marks below 10 below 20 below 30 below 40 below 50 below 60 below 70 below 80 below 90 below 100 no.of students 5, 9, 17, 29, 45, 60, 70, 78, 83, 85​

Answer 1

Step-by-step explanation:

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

lower limit

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

∴ Mean =48.4

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Answer 2

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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

lower limit

• 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

∴ Mean =48.4