Find the average of the numbers `12, 14, 16,18,20`

Find the mean of the following numbes: 20, 18, 16,25,19,22,18,16,23,14

Find the range of the data : 14, 15, 16, 18, 19, 25, 30, 41, 26, 16, 13, 18, 20 and 26.

Find the mean of the following numbers. " 16 14 12 8 23 26 " "18 20 23 9 11 22 " " 27 18 and 20 " State the value of the mean when each of these numbers is : (i) increased by 4. (ii) decreased by 6.

The median of the numbers 14 12, 12, 16, 13 and 18 is:

Find the mode of the observations 25, 20, 16, 12, 20, 16, 19, 23, 31, 20, 11, 18, 16.