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Calculate the average of the numbers in an array of numbers. The array: [2, 5, 17, 81, 9].

## Explanation

### How to calculate an average

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 average 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 average is 6

(Also called the Arithmetic Mean.)

### Accomplishing our Goal

To accomplish our task, we create a function called `averageArray()` and pass in our array.

We need to get the length of the array for our for-loop. Creating a sum and then dividing by the length gets our average.

Just return the number and print it to the console, and you are done!

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