```
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]
}
# Add your function below!
def average(numbers):
total = sum(numbers)
total = float(total)
length = len(numbers)
new = total / length
return new
def get_average(student):
homework = average(student["homework"])
quizzes = average(student["quizzes"])
tests = average(student["tests"])
return homework * 0.1 + quizzes * 0.3 + tests * 0.6
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(lloyd)
students = [lloyd , alice, tyler]
print students
def get_class_average(students):
results = []
for student in students:
results.append(get_average(student))
return average(results)
print get_class_average(students[lloyd, alice, tyler])
print get_letter_grade(get_average(students))
```

# 9/9 Help, what have I done wrong?

**alex.march**#1

**stetim94**#2

there are problems in your function calls, lets start here:

`print get_class_average(students[lloyd, alice, tyler])`

lets look at what students is:

`students = [lloyd , alice, tyler]`

students is a list with your students, so in your `get_letter_grade`

use `students`

or make a new list with the students (i would pick the first), but don't combine it.

then the next one:

`print get_letter_grade(get_average(students))`

`get_average()`

is designed for a single student, use `get_class_average instead, this will calculate the class average, and the convert it into a letter grade.

**system**#3

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