I am recieving the error message "

Oops, try again. get_class_average([alice]) resulted in an error: list indices must be integers, not str"

I expected to get the average weighted average of the class returned. I can't tell if I am trying to be too clever or just way off the mark. anyway my head is sore from thinking about it so I call for aid!

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