``python`

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)

float(total)

return total / float(len(numbers))

def get_average(student):

homework = average(student["homework"]) *0.10

quizzes = average(student["quizzes"]) *0.30

tests = average(student["tests"])*0.60

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)

def get_class_average(students):

results = []

for student in students:

results.append(get_average(student))

return average(results)

students = [lloyd, alice, tyler]

print get_class_average(students)

print get_letter_grade(students)