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.
Daily expenditure(in Rs): 100-150 150-200 200-250 250-300 300-350
Number of households: 4 5 12 2 2
Answers
The mean daily expenditure on food is 211.
Daily expenditure(in Rs): Number of households:
x f
100-150 4
150-200 5
200-250 12
250-300 2
300-350 2
xi xi × fi
(100+150) / 2 = 125 125 × 4 = 500
(150+200) / 2 = 175 175 × 5 = 875
(200+250) / 2 = 225 225 × 12 = 2700
(250+300) / 2 = 275 275 × 2= 550
(300+350) / 2 = 325 325 × 2 = 650
Mean = ∑ (fi × xi) / ∑ fi
= (500 + 875 + 2700 + 550 + 650) / (4 + 5 + 12 + 2 + 2)
= 5275 / 25
= 211.