What is the Formula for arithmetic mean?

The arithmetic mean is the average of all values. Add all of the values together and divide by the number of values.

Suppose you want to find the arithmetic mean of n numbers, which are x1, x2, x3, ... , xn.

Then the arithmetic mean = (x1 + x2 + x3 + ... + xn)/n , that is, the sum of all the values whose mean you want, divided by the number of values.

Example: values 2, 8, 11

The sum of the three is 21, divided by three gives the mean = 7