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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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Best answer

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.

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