I can't figure out what is wrong with this code.

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=sum(numbers)

total=float(total)

total=total / len(numbers)

`return total`

def get_average(student):

homework=average(student["homework"])

def get_average(student):

quizzes=average(student["quizzes"])

def get_average(student):

tests=average(student["tests"])

`return 0.1 * average(student["homework"]) + \`

0.3 * average(student["quizzes"]) + \

0.6 * average(student["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"
print get_letter_grade(get_average(lloyd))
```

def get_class_average(students):

results=[]

for student in students:

get_average(students)

results.append(get_average(student))

return average(results)

it says get_class_average([alice]) resulted in an error:list indices must be integers, not (then a word starting with s is cut off)

Any ideas?