This is what is printed.

B

91.15

Traceback (most recent call last):

File "python", line 52, in

File "python", line 48, in get_class_average

File "python", line 27, in get_average

TypeError: string indices must be integers, not str

I end up with the right math but i can not figure out how to fix the error.

Sorry if it's something stupid i'm new to coding and help would be very much appreciated.

```
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"])) * .1
quizzes = (average(student["quizzes"])) * .3
tests= (average(student["tests"])) *.6
grade = sum([homework,quizzes,tests])
return grade
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:
results.append(get_average(student))
return average(results)
print average(results)
print get_average(alice)
print get_class_average(alice)
```