Following is the pocket allowance of 10 students. Find out arithmetic mean using Short-cut Method.
`{:("Pocket Allowance(Rs.)",15,20,30,22,25,18,40,50,55,65):}`

Following are the marks obtained by 25 students in economics. Find out the mean marks by using Direct and Short-cut Method. {:("Marks",10,20,30,40,50,60),("Number of Students",5,2,3,8,4,3):}

Pocket allowance of 10 students is Rs. 15,20,30,22,25,18,40,50,55 and 65. Find out the average pocket allowance.

Mean pocket allowance is Rs18. Find the missing frequency k.

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):}

Pocket allowance of 5 students respectively are: 125, 75, 150, 175, 200 Find out arithmetic mean.