Oops, try again.

get_class_average([alice]) returned the correct result, but it

modified the class list or one of the student dictionaries, that's a

problem if using the function more than once!

```
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)
return total/len(numbers)
def get_average(student):
student["homework"]=0.1*average(student["homework"])
student["quizzes"]=0.3*average(student["quizzes"])
student["tests"]=0.6*average(student["tests"])
sum = student["homework"]+student["quizzes"]+student["tests"]
return sum
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(lloyd)
def get_class_average(students):
results=[]
for student in students:
results.append(get_average(student))
return average(results)
```