at first it was passing as correct, but it was not printing the letter grade. I made a few changes and this is where I am now. I have looked at quite a few posts on this issue and I cannot identify where I am going wrong. I have tried the float,total 3 different ways, still same result.

Traceback (most recent call last):

File "python", line 48, in

File "python", line 31, in get_average

TypeError: unsupported operand type(s) for *: 'NoneType' and 'float'

I would like to see a Letter grade.

```
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):
total = float(sum(numbers))
numbers = total / len(numbers)
return
def get_average(student):
homework = average(student["homework"])
quizzes = average(student["quizzes"])
tests = average(student["tests"])
score = homework * 0.1 + quizzes * 0.3 + tests * 0.6
return
print get_average()
def get_letter_grade(score):
if score >= 90:
return "A"
elif score >= 80 and score <90:
return "B"
elif score >= 70 and score <80:
return "C"
elif score >= 60 and score <70:
return "D"
else:
return "F"
print get_letter_grade()
get_letter_grade(get_average(lloyd))
```