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

for one it is OK but for a list it has an err. do not understand why?

```
Replace this line with your 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 = 0.0
total = sum(numbers)
return float(total)/len(numbers)
def get_average(student):
homework = average(student["homework"])
quizzes = average(student["quizzes"])
tests = average(student["tests"])
sum = 0.1 * homework + 0.3 * quizzes + 0.6 * tests
result_class.append(sum)
return sum
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"
def get_class_average(student):
return results.append(get_letter_grade(get_average(student)))
students = [lloyd, alice, tyler]
results = []
result_class = []
for item in students:
print get_class_average(item)
print results
print result_class
```