Question

C.I 0-10,10-20,20-30,30-40,40-50,50-60 and frequency 12,18,27,x,17,6 find x if x bar =28 mean

Answer 1

xi= 5, 15, 25, 35, 45, 55

fixi= 60, 270, 675, 765, 330

mean= sigma fixi/sigma fi

28= 2100+35x/ 80+x

x=20