The **Arithmetic Mean** is the average of the numbers: a calculated "central" value of a set of numbers.

To calculate it:

• add up all the numbers,

• then divide by how many numbers there are.

Example: what is the mean of 2, 7 and 9?

Add the numbers: 2 + 7 + 9 = 18

Divide by how many numbers (i.e. we added 3 numbers): 18 ÷ 3 = 6

So the mean is 6

Note: there are other types of mean such as **Geometric Mean** and **Harmonic Mean**.

../numbers/images/mean-user.js

See: Geometric Mean