9. review


#1



Here is my code for 9. review the site is saying Traceback (most recent call last):
  File "python", line 33, in <module>
NameError: name 'variance' is not defined when it is defined please help

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
    
def grades_average(grades):
    sum_of_grades = grades_sum(grades)
    average = sum_of_grades / float(len(grades))
    return average

def grades_variance(scores):
    average = grades_average(scores) 
    variance = 0
    for x in scores:
        variance = variance + ((average - x)**2)
        total_variance = variance/ len(scores)
    return total_variance
print grades_variance(grades)
def grades_std_deviation(variance):
    return varience **0.5
    varience = grades_variance(grades)
    print grades_std_deviation(variance)
print print_grades(grades)
print grades_sum(grades)
print grades_average(grades)
print grades_std_deviation(variance)


#2

They are two typos here that make the variable unusable correct that code and then try.


#3

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