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Find the mean of the following frequency...

Find the mean of the following frequency distributions: Class interval: 0-8 8-16 16-24 24-32 32-40 Frequency: 6 7 10 8 9

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`{(CI,x_i,fi,u,fu,f_u^2),(0-10,5,5,-2,-10,20),(10-20,15,8,-1,-8,8),(20-30,25,15,0,0,0),(30-40,35,16,1,16,16),(40-50,45,6,2,12,24),(0,0,0,0,sumf_i=50,sumf^2_u=68):}`
`u=(x-25)/4`
Mean = `A+ (sumf_u)/(N) h= 25 + 10/(50) xx10 = 25+2 =27`
varience `= h^2/(N^2) [ N (sumf_u^2 -(sumf_u)^2 ]`
`= (10)^2/(50)^2 [ 50xx68 -(10)^2]`
by solving the equation we get
varience = 132
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