The table below shows the daily expenditure on food of 25 households in a locality


Daily expenditure (in Rs)



100 - 150



150 - 200



200 - 250



250 - 300



300 - 350



Number of households



4



5



12



2



2



Find the mean daily expenditure on food by a suitable method

The above given data can be represented in the form of table as below:


Class Interval



fi



xi



di = xi - a



ui =



fiui



100-150



4



125



-100



-2



-8



150-200



5



175



-50



-1



-5



200-250



12



225



0



0



0



250-300



2



275



50



1



2



300-350



2



325



100



2



4




∑fi = 25






∑fiui = -7





= 211


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