# Find the mean daily expenditure on food by a suitable method.

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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.

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Here a = 125, h = 50, ∑fiui = 43

Now

$\overline{x}= a+(\frac{\Sigma f_iu_i}{\Sigma f_i})\times h$

= 125 + × 50

= 125 + (43 × 2)

= 125 + 86

= 211.

NOTE: If we consider first value as “a” then we dont get negative values in ui , fiui columns. Then it becomes easy for calculation.