7. The Variance


#1

I need help what am i doing 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
    
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 score in scores:
        variance = (average - score) ** 2 + variance
        results = float(variance) / len(scores)
        return results
    print grades_variance(grades)


#2

Is it wrong? What makes you say so? What is someone reading your question supposed to look for?


#3
for score in scores:
    variance += (average - score)**2
return variance/len(scores)

#4

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