erorr messages:

Oops, try again. get_class_average([alice]) returned 35.35 instead of 91.15 as expected

I keep on getting the same error message

```
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 homework * 0.1 + quizzes * 0.3 + tests * 0.
def get_letter_grade(score):
if score >= 90:
return "A"
if score >= 80:
return "B"
if score >= 70:
return "C"
if score >= 60:
return "D"
else:
return "F"
print get_letter_grade(get_average(lloyd))
students = ["lloyd","alice","tyler"]
def get_class_average(students):
results = []
for student in students:
results.append(get_average(student))
return average(results)
```