I have checked other threads and have still not found what is wrong.

File python in line 57 , in module.

File python line 54, in get_class_average

File python line 30 in get_average

TypeError: string indices must be integers not strings

```
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]
}
students = ['lloyd', 'alice', 'tyler']
# Add your function below!
def average(numbers):
total = sum(numbers)
total = float(total)
average = total / len(numbers)
return average
def get_average(student):
homework = average(student['homework'])
quizzes = average(student['quizzes'])
tests = average(student['tests'])
sum = (homework * .10) + (quizzes * .30) + (tests * .60)
return sum
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'
grade = get_average(lloyd)
print get_letter_grade(grade)
def get_class_average(students):
results = []
for student in students:
results.append(get_average(student))
return average(results)
print get_class_average(students)
print get_letter_grade(get_class_average(students))
```