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]

}

std_list = [lloyd, alice, tyler]

# Add your function below!

def average(numbers):

total = sum(numbers)

total = float(total) / len(numbers)

return total

def get_average(students):

std_hm = students["homework"]

std_qz = students["quizzes"]

std_ts = students["tests"]

```
homework = average(std_hm)
quizzes = average(std_qz)
tests = average(std_ts)
h_weight = homework * .1
h_quizzes = quizzes * .3
h_tests = tests * .6
ave = h_weight + h_quizzes + h_tests
return ave
```

def get_letter_grade(score):

if score >= 90:

grade = "A"

elif score >= 80 and score < 90:

grade = "B"

elif score >= 70 and score < 80:

grade = "C"

elif score >= 60 and score < 70:

grade = "D"

else:

grade = "F"

```
#print grade
return grade
```

def get_class_average(students):

results = []

```
for stud in students:
val = get_average(stud)
results.append(val)
result = average(results)
#print result
return result
#print average(results)
#return average(results)
```

std_avg = get_class_average(std_list)

print std_avg

print get_letter_grade(std_avg)

What might be missing with this? I have already created a list of std_list containing the 3 students

Output:

83.8666666667

B

None

Error encountered:

One of the following is missing or broken when we tried to use it: alice, lloyd, tyler, students, get_class_average, get_letter_grade

I apologize as I am really trying to learn Python. Unfortunately, I could not find where my mistakes are.