```
studnets = [lloyd, alice, tyler]
def average(numbers):
total = sum(numbers)
total = float(total)
average =total / len(numbers)
return average
def get_average(student):
homework= average(student["homework"])
quizzes = average(student["quizzes"])
test= average(student["tests"])
score = 0.1 * homework + 0.3 * quizzes+ 0.6*test
return score
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 studnet in students:
print students
results.append(get_average(studnet))
print results
print average(results)
```

I am getting the error : get_class_average([alice]) should return a number

what am I doing wrong?