```
```
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]
}
def average(numbers):
total=sum(numbers)
total=float(total)
return total/len(numbers)
# Add your function below!
def get_average(student):
homework=average(student['homework'])
quizzes=average(student['quizzes'])
tests=average(student['tests'])
return .1*homework+.3*quizzes+.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):
result=[]
for student in students:
result.append(get_average(student))
return average(students)
get_class_average([alice])
```

resulted in an error: unsupported operand type(s) for +: 'int' and 'dict'