9.Exam Statistics 9.Review


#1



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


Hi All,
Please help. I am getting below error message
" Oops, try again.
grades_variance([30, 89, 81, 76, 19, 34, 86, 72, 8, 79, 52])
returned 1048.2473703982 instead of the correct value 785.3553719008
"


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 each in grades:
        variance = variance + (average - each) ** 2
    tot_variance = variance/len(scores)
    return tot_variance 
grades_variance(grades)
    


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


print print_grades(grades)

print grades_sum(grades)

print grades_average(grades)

print grades_variance(grades)

print grades_std_deviation(variance)


#2

Instead of grades you need to loop over scores here.


#3

It worked. Thank you a lot.


#4

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