29. Find the mean of following Data
Class Interval 0-20
20-40
40-60
60-80
80-100
Frequnecy
5
3
5
3
Answers
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Step-by-step explanation:
xi=10,30,50,70,90
fi=15,18,21,29,17
A=50,L=20
di=-40,-20,0,20,40
ui=(di-h)=-2,-1,0,1,2
fi⋅ui=-30,-18,0,29,34
∑(fi⋅ui)=15
∑fi=N=100
Mean=A+h⋅(∑fi⋅uiN)
=50+20⋅(15100)
=50+3=53
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