line 53 name student isn't defined, 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]
}
def average(numbers):
total = sum(numbers)
total = float(total)
total = total/len(numbers)
return total
def get_average(student):
homework = average(student["homework"])
quizzes = average(student["quizzes"])
tests = average(student["tests"])
return 0.1* average(student["homework"]) + 0.3* average(student["quizzes"]) + 0.6* average(student["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"
get_letter_grade(get_average(lloyd))
print get_letter_grade
def get_class_average(students):
students = [lloyd, alice, tyler]
result = []
for student in students:
result.append(get_average(student))
return average(result)
print get_class_average(students)
print get_letter_grade(get_class_average(students))
```