1.

The table below shows the daily expenditure on food of 25 households in a locality.Find the mean daily expenditure on food by a suitable method.

Answer» `f_i = 4,5,12,2,2 => sumf_i= 25`
`x_i = 125,175,225,275,325`
`u_i= -2,-1,0,1,2`
`f_iu_i= -8,-5,0,2,4 => sumf_iu_i= -7`
mean=`a + (sumf_iu_i)/(sum _i)*h`
`=225 + (-7)/25*50`
`= 225 - 14 = 211`
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