The mean of 20 numbers is 22.Find out the mean of numbers if 3 is removed and 8 is added.

If the mean of six numbers is 41, then the sum of these numbers is

The mean of 31 numbers is 36.The mean of first 16 numbers is 32 and that of the last 16 numbers is 40. Then which is the 16^(th) number?

The sum of some even numbers starting from 2 is 420.Find the number of even numbers added.

Find the mean number of heads in three tosses of a fair coin.

Find the mean of first 99 natural numbers.

The sum of two numbers is 6 times their geometric mean, show that numbers are the ratio (3+2 sqrt2):(3-2 sqrt2)