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

It should move next level

```
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=["llyod","alice","tyler"]
# Add your function below!
def average(numbers):
total=sum(numbers)
result = float(total)/ len(numbers)
return result
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 x in students:
res=get_average(x)
results.append(res)
return(average(results))
a=get_class_average([lloyd,alice,tyler])
print student
print a
print get_letter_grade(a)
```