I've been having trouble with my code for a while, but I'm getting this error message:

"get_class_average([alice, lloyd]) returned 91.15 instead of 85.85 as expected"

Please help! Everything seems right to me. Am I missing any details?

Here's my 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]

}

def average(numbers):

total = sum(numbers)

total = float(total)

return total / len(numbers)

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'

def get_class_average(students):

results = []

for student in students:

results.append(get_average(student))

return average(results)