Oops, try again. get_class_average([alice]) returned 83.8666666667 instead of 91.15 as expected

i dont know whats my mistake..!!

```
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]
}
student=[lloyd,alice,tyler]
def average(numbers):
total=sum(numbers)
avg=float(total)/len(numbers)
return(avg)
def get_average(student):
homework1=average(student["homework"])
quizzes1=average(student["quizzes"])
tests1=average(student["tests"])
return ((homework1*0.1)+(quizzes1*.3)+(tests1*.6))
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"
return get_letter_grade(get_average(lloyd))
def get_class_average(students):
results=[]
for each in student:
results.append(get_average(each))
return average(results)
print get_class_average(students)
```