Find the arithmetic mean of first ten even natural numbers.

Find the arithmetic mean of first 8 natural numbers.

The arithmetic mean of first n odd natural numbers is :

Find the mean of first five natural numbers.

The mean of first 10 natural numbers is

Find the sum of first n natural numbers.

Find the mean and variance of the first n natural numbers.

Find the sum of first hundred even natural numbers divisible by 5.

Statement 1 The difference between the sum of the first 100 even natural numbers and the sum of the first 100 odd natural numbers is 100. Statement 2 The difference between the sum opf the first n even natural numbers and sum of the first n odd natural numbers is n.