This is the error message i am getting:

Oops, try again. One of the following is missing or broken when we tried to use it: alice, lloyd, tyler, students, get_class_average, get_letter_grade

```
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) / len(numbers)
return total
def get_average(student):
homework = average(student["homework"]) * 0.1
quizzes = average(student["quizzes"]) * 0.3
tests = average(student["tests"]) * 0.6
return homework + quizzes + tests
def get_letter_grade(score):
if score >= 90 :
return "A"
elif score >= 80 and score < 90 :
return "B"
elif score >= 70 and score < 80:
return "C"
elif score >= 60 and score < 70 :
return "D"
else :
return "F"
student_list = [lloyd, alice, tyler]
def get_class_average(students):
results = []
for student in students:
temp = get_average(student)
results.append(temp)
return average(results)
print get_class_average(student_list)
print get_letter_grade(get_average(lloyd))
```