Keeps giving the error below after adding the last three lines of code. Works for when I use single dictionaries, eg lloyd or alice or tyler. But the moment I use more than one, it flips.

Traceback (most recent call last):

File "python", line 62, in

File "python", line 57, in get_class_average

NameError: global name 'student' is not defined

```
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)
results = total/len(numbers)
return results
def get_average(student):
homework = average(student["homework"])
quiz = average(student["quizzes"])
tests = average(student["tests"])
h_mark = 0.1 * homework
q_mark = 0.3 * quiz
t_mark = 0.6 * tests
grade = float(h_mark + q_mark + t_mark)
return grade
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(lloyd))
def get_class_average(students):
results = []
for item in students:
get_average(student)
results.append(get_average(student))
return average(results)
students = [lloyd, alice, tyler]
print get_class_average(students)
print get_letter_grade(get_class_average(students))
```