the error box keeps coming up with this

Oops, try again. get_average(alice) raised the following error: unsupported operand type(s) for +: 'int' and 'str'

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)

total = float(total)

total = total / len(numbers)

return total

get_average = lloyd, alice, tyler

def get_average(student):

homework = average(["homework"])

quizzes = average(["quizzes"])

tests = (["tests"])

return homework*0.1, quizzes*0.3, tests*0.6

thank you to any one in advance!