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

I haven't found any error, but i always get the message above when i submit the 'code' below. Any help would be grateful

```
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 = sum(numbers)
total = float(total)
total = total / len(numbers)
return total
def get_average(student):
homework= average(student["homework"])
quizzes= average(student["quizzes"])
tests= average(student["tests"])
return 0.1 * homework + 0.3 * quizzes + 0.6 * 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"
print get_letter_grade(get_average(lloyd))
students = [lloyd , alice , tyler]
def get_class_average(student):
results = []
for student in students:
get_average(student)
results.append(get_average(student))
return average(results)
```