Find the mean of the following frequency distribution.
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mean=fi*xi/N
N=f1+f2+f3.....fn
xi=upper limit+lower limit/2
x1=0+20/2=10
x2=30
x3=50
x4=70
x5=90
N=17+28+32+24+19=120
mean=17*10+28*30+32*50+24*70+19*90/120
=170+840+1600+1680+1710/120
=50
HOPE THIS HELPS
:)
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