Here is my code, was approved until I reached 8/9:

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]

}

students = [lloyd, alice, tyler]

# Add your function below!

def average(numbers):

total = sum(numbers)

total = float(total)

avg = total/len(numbers)

print avg

def get_average(student):

homework = average(student["homework"])

quizzes = average(student["quizzes"])

tests = average(student["tests"])

print (0.1 * homework) + (0.3 * quizzes) + (0.6 * tests)

def get_letter_grade(score):

if score >= 90.0:

return "A"

elif score >= 80.0:

return "B"

elif score >= 70.0:

return "C"

elif score >= 60.0:

return "D"

else:

return "F"

def get_class_average(students):

results = []

for student in students:

results.append(get_average(student))

return average(results)

But for some reason, I get this error message?

```
Oops, try again.
get_class_average([alice]) resulted in an error: unsupported operand type(s) for *: 'float' and 'NoneType'
```