The answer is B but error is still come out.

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

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 = float(sum(numbers))

result = total / len(numbers)

return result

def get_average(student):

homework = average(student['homework']) * 0.1

quizzes = average(student['quizzes']) * 0.3

tests = average(student['tests']) * 0.6

```
students_score = homework + quizzes + tests
return students_score
```

def get_letter_grade(score):

```
if score >= 90 :
print 'A'
elif score >=80 :
print 'B'
elif score >= 70 :
print 'C'
elif score >= 60 :
print 'D'
else :
print 'F'
```

def get_class_average(students):

results = []

```
for student in students:
results.append(get_average(student))
return get_letter_grade(average(results))
```

get_class_average([lloyd,alice,tyler])