calculate mean of the following.[ (marks Less) 20 30 40 50 60 70 ] [ (No. of Persons) 8 20 35 55 69 80 ] ?
Answers
Given : (marks Less than ) 20 30 40 50 60 70 ] [ (No. of Persons) 8 20 35 55 69 80 ] ?
To find : Mean Marks
Solution:
Less than 20 8
Less than 30 20
Less than 40 35
Less than 50 55
Less than 60 69
Less than 70 80
Marks f mean Marks A = (Mean - 35)/10 f * A
10 - 20 8 15 -2 -16
20 - 30 12 25 -1 -12
30 - 40 15 35 0 0
40 - 50 20 45 1 20
50 - 60 14 55 2 28
60 - 70 11 65 3 33
80 53
Mean = 35 + 10 * 53/80
= 35 + 6.625
= 41.625
Mean Marks = 41.625
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