## Mean

Mean is the average of the numbers.

Table of Contents

## How to Find the Mean

It is easy to calculate:

- add up all the numbers
- divide by how many numbers there are

In other words it is the sum divided by the count

Example

What is the Mean of these numbers?

4, 10, 7

Step 1 | Add the numbers | 4 + 10 + 7 = 21 |

Step 2 | Divide by how many numbers (there are 3 numbers) | 21 / 3 = 7 |

The Mean is 7

## Mean For Negative Numbers

How to handle negative numbers?

Adding a negative number is the same as subtracting the number (without the negative).

Example

4 + (−1) = 4−1 = 3.

Knowing this, let us try!

Example

Find the mean of these numbers:

−4, 7, 3, −10, 5

The sum of these numbers is −4 + 7 + 3 − 10 + 5 = 1

There are 5 numbers.

The mean is equal to 1 ÷ 5 = 0.2

The mean of the above numbers is 0.2

Here is how to do it one line:

Note:

the mean above is also called the Arithmetic Mean. There are other means such as the Geometric Mean and Harmonic Mean.