Learn

The average test grade can be found by dividing the sum of the grades by the total number of grades.

Luckily, we just created an awesome function, `grades_sum`

to compute the sum.

### Instructions

**1.**

Define a function, `grades_average`

, below the `grades_sum`

function that does the following:

- Has one argument,
`grades_input`

, a list - Calls
`grades_sum`

with`grades_input`

- Computes the average of the grades by dividing that sum by
`float(len(grades_input))`

. - Returns the average.

Call the newly created `grades_average`

function with the list of `grades`

and **print the result**.

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