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The following table shows monthly pocket...

The following table shows monthly pocket expenses of the students of a class. Find out average pocket expenses.
`{:("Pocket Expenses(Rs.)",20-29,30-39,40-49,50-59,60-69),("Number of Students"," "10," "8," "6," "4," "2):}`

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Calculation of arithmetic mean of inclusive series is the same as of exclusive series.

`barX=A+(sumfd')/(sumf)xxC`
`=44.5+(-20)/30xx10`
`=44.5-20/3`
`=445-6.67=37.83`
Average Pocket Expenses = Rs. 37.83.
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