```
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)
result = float(total)/len(numbers)
print result
return result
def get_average(student):
homework=average(student['homework'])
quizzes=average(student['quizzes'])
tests=average(student['tests'])
a= 0.1 * homework + \
0.3 * quizzes + \
0.6 * tests
return a
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"
def get_class_average(students) :
result=[]
for student in students:
result.append(get_average(student))
return average(result)
get_class_average(['alice'])
```

'''

In above code it shows following errors:

Traceback (most recent call last):

File "python", line 57, in <module>

File "python", line 53, in get_class_average

File "python", line 28, in get_average

TypeError: string indices must be integers, not str