I am trying to have the class average print, but whenever I try changing my code about, I keep getting this error message:

"Oops, try again. One of the following is missing or broken when we tried to use it: alice, lloyd, tyler, students, get_class_average, get_letter_grade". My code is as follows:

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 = 0

total = sum(numbers)

avg = float(total)/len(numbers)

return avg

def get_average(student):

homework = average(student["homework"])

quizzes = average(student["quizzes"])

tests = average(student["tests"])

fngrd = ((0.1*homework)+(0.3*quizzes)+(0.6*tests))

return fngrd

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)

#print average(results)

print get_class_average(students)

print get_letter_grade(get_class_average(students))

I commented out the "print average(results)" to test the other functions I wanted to print to the screen. How do I get all these functions to print to the console, and what am I missing?