<Below this line, add a link to the EXACT exercise that you are stuck at.>

https://www.codecademy.com/courses/learn-python/lessons/student-becomes-the-teacher/exercises/just-weight-and-see?action=lesson_resume

< error messages >

get_average(alice) raised the following error: unsupported operand type(s) for *: ‘float’ and ‘NoneType’

```
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]
}
numbers = (5,4,7,6,1)
def average(numbers):
total = sum(numbers)
total = float(total)/len(numbers)
print total
def get_average(student):
homework = average(student["homework"])
quizzes = average(student["quizzes"])
tests = average(student["tests"])
return 0.1 * average(student["homework"]) + 0.3 * average(student["quizzes"]) + 0.6 * average(student["quizzes"])
```

Hi there, I don't understand how to solve this.