Hello, can I ask why this results in error 'get_class_average([alice]) returned 83.8666666667 instead of 91.15 as expected'?

That 91.15 is actually Alice's own average, not the class'. So supposedly 83.867 is correct (although I did not really calculate it manually).

```
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))
classlist=[lloyd, alice, tyler]
def get_class_average(student):
results=[]
for student in classlist:
results.append(get_average(student))
return average(results)
```