Answer :

Let us solve by direct method since the frequencies have smaller values.

This is grouped frequency distribution.


We shall represent them by creating a table having columns of class intervals, midpoints, frequencies, and product of these midpoints and frequencies.



So now, we have


fi = 50 and xifi = 7260


For grouped frequency distribution, mean is taken out from the formula:



[from the table]



Mean = 145.2


Thus, the mean daily expenditure of the students is Rs. 145.2.


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