when I run my code it said this Oops, try again. get_class_average([alice]) resulted in an error: float division by zero

I wanted it to show the class average but it didn't

```
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]
}
student = [lloyd, tyler, alice]
# Add your function below!
def average(numbers):
total = sum(numbers)
total = float(total)
average = total / len(numbers)
return average
def get_average(student):
homework = average(student["homework"])
quizzes = average(student["quizzes"])
tests = average(student["tests"])
return 0.1 * homework + 0.3 * quizzes + 0.6 * tests
def get_letter_grade(score):
if score >= 90:
return "A"
elif score <= 90 and score >= 80:
return "B"
elif score <= 80 and score >= 70:
return "C"
elif score <= 70 and score >= 60:
return "D"
else:
return "F"
def get_class_average(student):
results = []
average(results)
for student in student:
results.append(get_average(student))
return results
print results
```