The arithmetic mean of the series 1, 2, 4, 8, 16, ... 2ⁿ is

The mean of p, q, r, s and t is 280. If the mean of p, r and t is 240, what is the mean of q and s?

The average of 6 numbers is 5. The first number is increased by 2, second by 4, third by 8 and so on. The average of new numbers is

A set of 15 numbers has mean 42. Mean of first 8 is 39 and last 8 is 44. Value of eighth number?

If M is the mean of the first 100 even natural numbers, then what is the mean of the first 100 odd natural numbers?

If the average of m numbers is n*n and that of n numbers is m*m , then the average of m+n numbers is