By short cut method, find the average marks of a student from the following table :
Marks obtained Below 10 Below 20 Below 30 Below 40 Below 50 Below do
No. of students | 25 40 60 T 75, | 80 | 85
Answers
Given : Marks obtained by students
To find : Average Marks
Solution:
cf Class f Class Mean f*Class mean
Below 10 25 0 - 10 25 5 125
Below 20 40 10 - 20 15 15 225
Below 30 60 20 - 30 20 25 500
Below 40 75 30 - 40 15 35 525
Below 50 80 40 - 50 5 45 225
Below 60 85 50 - 60 5 55 275
85 1875
Mean = 1875/85
= 22.06
Average Marks of students = 22
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