Traceback (most recent call last):

File "python", line 45, in

File "python", line 50, in get_class_average

File "python", line 28, in get_average

TypeError: string indices must be integers, not str

Finally, print out the result of calling get_class_average with your students list. Your students should be [lloyd, alice, tyler].

Then, print the result of get_letter_grade for the class's average.

```
Replace this line with your 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)
avg=total/len(numbers)
return avg
def get_average(student):
homework=average(student["homework"])
quizzes=average(student["quizzes"])
tests=average(student["tests"])
return 0.1*homework + 0.3*quizzes+ 0.6*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))
students=["alice","lloyd","tyler"]
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))
```