Hi, in the exercise "Part of the Whole", I'm getting the error message below and cannot get around it. I'm sure something is missing and posted my code below if you can help me figure it out. Thanks!

**> Oops, try again.****> get_class_average([alice]) should return a number**

```
def average(numbers):
total = float(sum(numbers)) / len(numbers)
return total
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 >= 80:
return "B"
elif score >= 70:
return "C"
elif score >= 60:
return "D"
else:
return "F"
def get_class_average(students):
students = [lloyd, alice, tyler]
results = []
for student in students:
return results.append(get_average(student))
return average(results)
```