If the mean of the numbers 0, (x+2), (3x+6), and (4x+8) is 4, find their mean deviation.

The variance of x, 2x, 3x, 4x and 5x is

What is the mean deviation of x, 2x, x+1 and 3x. If their mean is 2?

Calculate the standard deviation of the following marks; 2, 3, 6, 2, 5, 0, 4, 2

Calculate the mean deviation of the first five prime numbers.