I'm pretty lost on this one. Heres what i got

```
grades = [100, 100, 90, 40, 80, 100, 85, 70, 90, 65, 90, 85, 50.5]
```def grades_sum(scores):

total = 0

for item in scores:

total = total + item

return total

print grades_sum(grades)

def grades_average(grades):

total = 0

for i in grades:

total = total + i

new_total = total / float(len(grades))

return total

print grades_average(grades)