I am having the same problem.

My code is

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)

length = len(numbers)

return((total) /len(numbers))

def get_average(student):

homework = average(student["homework"])

quizzes = average(student["quizzes"])

tests = average(student["tests"])

return ((0.1 * homework) + (0.3 * quizzes) + (0.6 * tests))

def get_letter_grade(score):

if score >= 90:

return("A")

elif score >= 80 and score < 90:

return("B")

elif score >= 70 and score < 80:

return("C")

elif score >= 60 and score < 70:

return("D")

else:

return("F")

def get_class_average(students):

results=[]

for student in students:

result = get_average(student)

results.append(result)

return(average(results))

class_average = get_class_average([lloyd,alice,tyler])

print(class_average)

average_grade = get_letter_grade(class_average)

print(average_grade)

and my output window shows :

83.8666666667

B

The error message I get is :

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