How to calculate arithmetic mean？

To calculate the arithmetic mean, follow these steps:

1. Add up all the numbers you want to find the mean of.
2. Divide the sum by the total number of items in the set.

For example, if you want to find the arithmetic mean of the numbers 2, 4, 6, and 8:

1. Add them up: 2 + 4 + 6 + 8 = 20
2. Divide by the total number of items: 20 ÷ 4 = 5

Therefore, the arithmetic mean of the numbers 2, 4, 6, and 8 is 5.