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

What's wrong? I get an output: "83.8666666667

B"

I get it. What's wrong?

```
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):
return float(sum(numbers)) / len(numbers)
def get_average(student):
return (average(student["homework"]) * 0.1) + (average(student["quizzes"]) * 0.3) + (average(student["tests"]) * 0.6)
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 student in students:
results.append(get_average(student))
return average(results)
print get_class_average([lloyd, alice, tyler])
print get_letter_grade(get_class_average([lloyd, alice, tyler]))
```