## FAQs & How-to's

#### What is this calculator for?

This calculator finds the average (arithmetic mean) of a collection of numbers.

#### Can I embed this on my website?

Sure. Embedding is allowed as long as you promise to follow our conditions. Here's the embed code:

 <iframe width="415" height="220" src="http://www.a-calculator.com/average/embed.html" frameborder="0" allowtransparency="true"></iframe> 

#### How can I find the average manually?

To take the average of a group of numbers, you simply sum it then divide by the size of the group. For example, there are 3 numbers in the list 1, -42, 5, so the average is: $$\frac{1 -42 + 5}{3} = -12.$$ In mathematical notation the arithmetic mean can be written as: $$\frac{1}{n}\sum\limits_{i = 0}^n a_i = \frac{1}{n}(a_1 + a_2 + \dots + a_n).$$