Here is the code I use

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 = 0

total = sum(numbers)

total = float(total)/len(numbers)

return total

def get_average(student):

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

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

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

return homework+quizzes+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))

def getClassAverage(students):

aver= (get_average(lloyd) + get_average(tyler) + get_average(alice))/len(students)

return aver

print getClassAverage(students)

This is the error I get "Oops, try again. get_class_average([alice]) returned 83.8666666667 instead of 91.15 as expected"