dont know whats wrong i think it may be an indentation error but am not quite sure.

it keeps on saying

One of the following is missing or broken when we tried to use it: alice, lloyd, tyler, students, get_class_average, get_letter_grade

and

File "python", line 46

def get_class_average(students):

^

SyntaxError: invalid syntax

```
Replace this line with your code.
lloyd = {
"name": "Lloyd",
"homework": [90.0, 97.0, 75.0, 92.0],
"quizzes": [88.0, 40.0, 94.0],
"tests": [75.0, 90.0]
}
alice = {
"name": "Alice",
"homework": [100.0, 92.0, 98.0, 100.0],
"quizzes": [82.0, 83.0, 91.0],
"tests": [89.0, 97.0]
}
tyler = {
"name": "Tyler",
"homework": [0.0, 87.0, 75.0, 22.0],
"quizzes": [0.0, 75.0, 78.0],
"tests": [100.0, 100.0]
}
def average(numbers):
sum(numbers)
total=sum(numbers)
total = float(total)
return total/len(numbers)
def get_average(student):
return average(student["homework"]) * 0.1 + \
average(student["quizzes"]) * 0.3 + \
average(student["tests"]) * 0.6
def get_letter_grade(score):
if score >= 90:
return "A"
if score >= 80:
return "B"
if score >= 70:
return "C"
if score >= 60:
return "D"
else:
return "F"
get_letter_grade(get_average(lloyd))
print get_letter_grade(get_average(lloyd)
def get_class_average(students):
results =[]
for student in students:
avg = get_average(student)
results.append(avg)
return average(results)
print average(results)
students = [alice, lloyd, tyler]
print get_class_average(students))
```

please help