A class teacher has the following attendance record of 40 students of a class for the whole team. find the mean number of days a student was present out of 56 days in the term by deviation method.
Answers
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Given : A class teacher has the following attendance record of 40 students of a class for the whole team.
Complete Data is:
35-38 38-41 41-44 44-47 47-50 50-53 53-56
1 3 4 4 7 10 11
To Find : the mean number of days a student was present out of 56 days
Solution:
A = Assume mean = 48.5 , h = 3
Days f Mean u =(Mean - A)/3 fu
35-38 1 36.5 -4 -4
38-41 3 39.5 -3 -9
41-44 4 42.5 -2 -8
44-47 4 45.5 -1 -4
47-50 7 48.5 0 0
50-53 10 51.5 1 10
53-56 11 54.5 2 22
Total 40 7
48.5 + 3 * 7 / 40
= 48.5 + 0.525
= 49.025
mean number of days a student was present out of 56 days = 49.025
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