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Exam Statistics

Computing the Average

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**.