Error Message:

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

Code seems to be working fine, I passed all other lessons before 9/9 without any error. I think it may be an error earlier in the code but I am not sure.

```
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]
}
def average(numbers):
total = sum(numbers)
total = float(total)
total = total / (len(numbers))
return total
def get_average(student):
homework = average(student['homework'])
quizzes = average(student['quizzes'])
tests = average(student['tests'])
#student[homework] = .1
#student[quizzes] = .3
#student[tests] = .6
sum = .1 * homework + .3 * quizzes + .6 * tests
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'
print get_letter_grade(get_average(lloyd))
def get_class_average(students):
results = []
for student in students:
results.append(get_average(student))
return average(results)
students = ['lloyd', 'alice', 'tyler',]
print get_class_average(students)
return get_letter_grade(get_class_average(students))
```