What's wrong i do ?

```
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))
length = len(numbers)
return total / length
def get_average(students):
homework = average(students["homework"])
quizzes = average(students["quizzes"])
tests = average(students["tests"])
return (homework*0.1+quizzes*0.3+tests*0.6)
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"
get_letter_grade
get_average(lloyd)
def get_class_average(student):
result = []
for n in student:
result.append(get_average(n))
return average(result)
```

error:Oops, try again.

get_class_average([alice, lloyd]) returned 91.15 instead of 85.85 as expected