HI the **instruction** says..

Define a function **grades_average()**, below the **grades_sum()** function that does the following:

**01.** Has one argument, **grades**, a **list**

`def grades_average(grades):`

**02.** **Calls grades_sum** with **grades** `(you should call the function grades_sum with the argument grades and saved it inside a variable)`

```
def grades_average(grades):
sums = grades_sum(grades)
```

you can change the name **sums** with any name you want...

**03.** **Computes the average** of the grades by **dividing that sum** by **float(len(grades))**.

in this case the **sum** will be the **sums** variable where we saved **grades_sum(grades)**

```
def grades_average(grades):
sums = grades_sum(grades)
G_average = sums / float(len(grades))
```

you can change the name **G_average** with any name you want...

**04.** **Returns the average**.

```
def grades_average(grades):
sums = grades_sum(grades)
G_average = sums / float(len(grades))
return G_average
```