```
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)
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*homework + 0.3*quizzes + 0.6*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(lloyd))
def get_class_average(students):
results = []
for i in students:
results.append(get_average(i))
class_average = average(results)
return class_average
class_average = get_class_average([lloyd, alice, tyler])
print class_average
print get_letter_grade(class_average)
print get_class_average(student)
print get_class_grade(class_average)
```

This program gives an error message in the last two lines.

Please help me to fix this.

`Replace this line with your code.`