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)

total = total / len(numbers)

return total

def get_average(student):

homework = 0.1 *average(student["homework"])

quizzes = 0.3 *average(student["quizzes"])

tests = 0.6 *average(student["tests"])

return homework+quizzes+tests

# Add your function below!

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):

results=[]

for student in students:

results.append(get_average(student))

return average(results)

print get_class_average (lloyd)

print get_class_average(alice)

print get_class_average(tyler)

print get_letter_grade(average)

**ERROR IS**

Traceback (most recent call last):

File "python", line 46, in

File "python", line 44, in get_class_average

File "python", line 25, in get_average

TypeError: string indices must be integers, not str