8.0 Standard Deviation


#1



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

Oops, try again. grades_std_deviation(8.5833333333) raised an error: 'float' object is not iterable


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 i in scores:
        variance+=(average -i) ** 2
    return variance/len(scores)
print grades_variance(grades)
def grades_std_deviation(variance):
    return grades_variance(variance) ** 0.5
print grades_std_deviation(grades)


#2

your last def should look like that ;
def grades_std_deviation(variance):
return variance ** 0.5
print grades_std_deviation(grades_variance(grades))
or as the site asked;
def grades_std_deviation(variance):
return variance ** 0.5
variance = grades_variance(grades)
print grades_std_deviation(variance)


#3

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