When I run it, it always comes out with an error saying "get_class_average([alice]) returned 83.8666666667 instead of 91.15 as expected"

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)

return result

def get_average(lloyd):

x = average(lloyd["homework"])

y = average(lloyd["quizzes"])

x = average(lloyd["tests"])

return x * 0.1 + y * 0.3 + z * 0.6

def get_average(alice):

x = average(alice["homework"])

y = average(alice["quizzes"])

z = average(alice["tests"])

return x * 0.1 + y * 0.3 + z * 0.6

def get_average(tyler):

x = average(tyler["homework"])

y = average(tyler["quizzes"])

z = average(tyler["tests"])

return x * 0.1 + y * 0.3 + z * 0.6

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'

group = [tyler, alice, lloyd]

def get_class_average(students):

results = []

for student in group:

results.append(get_average(student))

return average(results)