Oops, try again. get_class_average([alice]) returned 83.8666666667 instead of 91.15 as expected

I have looked at three different posts and cannot figure out where the problem is.

```
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]
}
# Add your function below!
def average(numbers):
total=float(sum(numbers))/len(numbers)
return total
def get_average(student):
homework=average(student['homework'])
quizzes=average(student['quizzes'])
tests=average(student['tests'])
return .1*homework + .3*quizzes + .6*tests
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'
return get_average(lloyd)
print get_letter_grade
students=[lloyd,alice,tyler]
def get_class_average(student):
results = []
for student in students:
results.append(get_average(student))
return average(results)
```