The posts here helped me fix a couple issues, but I am still getting this error:

Oops, try again. get_class_average([alice]) should return a number

Here is my 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]
}
# Add your function below!
def average(numbers):
total = sum(numbers)
total = float(total)
return total/len(numbers)
def get_average(student):
homework = average(student['homework'])
quizzes = average(student['quizzes'])
tests = average(student['tests'])
return (homework * .10 + quizzes * .3 + tests * .6)
def get_letter_grade(score):
if score >= 90.0:
return 'A'
elif score >= 80.0:
return 'B'
elif score >= 70.0:
return 'C'
elif score >= 60.0:
return 'D'
else:
return 'F';
get_letter_grade(get_average(lloyd))
def get_class_average(students):
results = []
for student in students:
x = get_average(student)
results.append(x)
y = (results)
return y
```

What am I doing wrong?