Traceback (most recent call last):

File "python", line 55, in

File "python", line 51, in get_class_average

File "python", line 28, in get_average

TypeError: string indices must be integers, not str

I was hoping to see, All correct move on

```
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]
}
def average(numbers):
total=sum(numbers)
total=float(total)
result=total/len(numbers)
return result
def get_average(student):
homework = average(student["homework"])
quizzes = average(student["quizzes"])
tests = average(student["tests"])
return (homework*0.1+quizzes*0.3+tests*0.6)
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"
get_average(lloyd)
def get_class_average(students):
results=[]
for student in students:
results.append( get_average(student))
return average(results)
students = ["lloyd", "alice", "tyler"]
print get_class_average(students)
print get_letter_grade(students)
```