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Here, assumed mean (A) = 225
Class Interval Number of households (fi) Mid-point (xi) di = xi - A fidi
100-150 4 125 -100 -400
150-200 5 175 -50 -250
200-250 12 225 0 0
250-300 2 275 50 100
300-350 2 325 100 200
Sum fi = 25 Sum fidi = -350
Mean = x̄ = A + ∑fidi /∑fi = 225 + (-350/25) = 225 - 14 = 211
The mean daily expenditure on food is 211
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