The error message that comes up says " 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". This message doesn't come in the previous exercises, where one defines the functions. Only when I am trying to print the class average, I get the error message.

```
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):
homeworks = average(student["homework"])
quiz = average(student["quizzes"])
test = average(student["tests"])
return 0.1*homeworks+0.3*quiz+0.6*test
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(get_average(lloyd))
def get_class_average(students):
results =[]
for each in students:
results.append(get_average(each))
return average(results)
students_all = [lloyd, alice, tyler]
print get_class_average(students_all)
print get_letter_grade(get_class_average(students_all))
```