The table below shows the daily expenditure on the food of 25 households in a locality. Find the mean daily expenditure on food. Daily E

Daily Expenditure (in Rs.)	100-150	150-200	200-250	250-300	300-350
Number of Households	4	5	12	2	2

Daily Expenditure	No of households (f_i)	Class Mark (x_i)	x_i - 225	$\mathrm{u_i = \frac{x_i-2250}{50}}$	f_iu_i
100-150	4	$\mathrm{\frac{100+150}{2} = 125}$	125-220=-100	$\mathrm{\frac{-100}{50}=-2}$	$\mathrm{4\times (-2) = -8}$
150-200	5	$\mathrm{\frac{150+200 = 175}{2}}$	175-225=-50	$\mathrm{\frac{-50}{50}=-1}$	$\mathrm{5\times (-1) = -5}$
200-250	12	$\mathrm{\frac{200+250}{2} = 225}$	225-225=0	$\mathrm{\frac{0}{50}=0}$	$\mathrm{12\times (0) = 0}$
250-300	2	$\mathrm{\frac{250+300}{2} = 275}$	275-225=50	$\mathrm{\frac{50}{50}=1}$	$\mathrm{2\times 1 = 2}$
300-350	2	$\mathrm{\frac{300+350}{2}=325}$	325-225=100	$\mathrm{\frac{100}{50}=2}$	$\mathrm{2\times 2 = 4}$
	$\mathrm{\Sigma f_i = 25}$				$\mathrm{\Sigma f_ix_i = -7}$