```
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 = total/len(numbers)
return total
def get_average (student):
homework = average(student["homework"])
quizzes = average(student["quizzes"])
tests = average(student["tests"])
sum = homework*0.10 + quizzes*0.30 + tests*0.60
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 (students):
results = []
for each_student in students:
results.append (get_average(each_student))
return average(results)
students = get_class_average([lloyd, alice, tyler])
print ' Average score for students: %f' % students
print ' Average grade for students: ' + get_letter_grade(students)
```

I get this error even though the answer is correct! any ideas anyone please?

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