9. review


#1



https://www.codecademy.com/courses/python-intermediate-en-7mgOa/2/3?curriculum_id=4f89dab3d788890003000096#


Having issues with my code. If someone can point me to the error i cant for the life of me see the problem.
100
100
90
40
80
100
85
70
90
65
90
85
50.5
None
1045.5
80.4230769231
Traceback (most recent call last):
File "python", line 36, in
NameError: name 'scores' is not defined


I thought i structred and defined everything correctly..... I was wrong.


grades = [100, 100, 90, 40, 80, 100, 85, 70, 90, 65, 90, 85, 50.5]

def print_grades(grades):
    for grade in grades:
        print grade

def grades_sum(grades):
    total = 0
    for grade in grades: 
        total += grade
    return total
    print grades_sum(grades)
    
def grades_average(grades):
    sum_of_grades = grades_sum(grades)
    average = sum_of_grades / float(len(grades))
    return average
    print grades_average(grades)

def grades_variance(scores):
    average = grades_average(scores)
    variance = 0
    for score in scores:
        variance += ((average - score) ** 2)
    return variance / len(scores)
    print grades_variance(grades)

def grades_std_deviation(variance):
    return (variance ** 0.5)
    variance = grades_variance(grades)
    print grades_std_deviation(variance)

print print_grades(grades)
print grades_sum(grades)
print grades_average(grades)
print grades_variance(scores)
print grades_std_deviation(variance)


#2

At the beginning your list is named "grades", but it should be "scores".


#3

I changed it and now it is telling me that variance is not defined. i changed the grades_std_deviation function and put variance on top of the return and still nada.


#4

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