This is my code, I do not understand what is wrong with it, please help me...

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=float(sum(numbers))

result=total/float(len(numbers))

return result

def get_average (student):

summa = 0

for key in student:

if key == "homework":

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

elif key == "quizzes":

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

elif key == "tests":

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

return summa

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"

students=[lloyd,alice,tyler]

def get_class_average(students):

results=[]

for student in students:

results.append(get_average(students))

return average(results)

`Replace this line with your code.`