Find the mean of numbers 25,30,27,23 and 25.

Find the median of the data 30,25,32,23,42,36,40,33,21,43.

Answer the following : Find variance and S.D. for the following set of numbers. 25, 21, 23, 29, 27, 22, 28, 23, 21, 25

Find the HCF of the following numbers : 25, 75

The ration of two numbers is 31:23 and their sum is 216. Find these numbers.

The mean of five numbers is 50, out of which mean of 4 numbers is 46, Find the 5^(th) number.