When i run the code it says that i can't call alice as a object...ive been doing this problem for two hours and i feel really stupid can someone help me out

```
def average(numbers):
total = sum(numbers)
total = float(total)
return total / len(numbers)
def get_letter_grade(score):
if score >= 90:
return "A"
elif score >= 80:
return "B"
elif score >= 70:
return "C"
elif score >= 60:
return "D"
else:
return "F"
def student_average(name):
homework = (average(name("homework")) * .1)
quizzes = (average(name("quizzes")) * .3)
tests = (average(name("tests")) * .6)
sa = homework + quizzes + tests
return sa
def get_class_average(students):
results = []
for item in students:
results.append(student_average(item))
return average(results)
```