The arithmetic mean of the numbers 9, 12, 15, 18, 20, 22 is increased by 1, if 15 is replaced by

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

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

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

The average age of 30 boys in a class is 15 years. If we include the age of two teachers the average age increases by 1. Find the sum of ages of the two teachers.