The Variance


#1

I have entered the below code but getting the error Oops, try again. grades_variance([9, 8, 8, 5, 7]) returned 2.56 instead of the expected: 1.84
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:
score = (average - score) ** 2 + variance
return score
score = variance % scores
print grades_variance(grades)


#2

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