Arithmetic mean of these items 5,7,9,15,20 is:

Arithmetic mean of these items : 10 , 15, X, 20, 30, is 20. Find out the missing item.

A group of 10 items has arithmetic mean 6. If the arithmetic mean of 4 of these items is 7.5, then the mean of the remaining items is

A group of 10 items has arithmetic mean 6. If the arithmetic mean of 4 of these items is 7.5, then the mean of the remaining items is

Arithmetic mean of a series is 15 and if 5 is added in all the items of this series, the new arithmetic mean will be:

The Arithmetic mean of 10 number is -7 . If 5 is added to every number, then the new arithmetic mean is …………… .

Find the arithmetic mean of the following -17, -13, -9, -5, -1,………