The table given below shows the daily expenditure on food of 30 households in a locality:
Find the mean and median of daily expenditure on food.
According to the direct method
Mean = 
⇒ Mean = 
⇒ Mean = 205
Total frequency(n) = 30
15 lies in the interval 200-250
so l (lower limit) = 200
cf(Cumulative frequency of the preceding class 200-250) = 13
f (frequency of median class) = 12
h (class size) = 50
Median = 
Median = 
Median = 208.33
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