Hello all,

Wondered if anyone has seen this issue before.

I'm stuck in Exam Statistics Review - Section 9. All my functions look good and print properly however, I keep getting this error message whenever I Save & Submit code.

I've printed the grades list before and after printing the function values. Please help.

The output of my functions and code are as follows:

[100, 100, 90, 40, 80, 100, 85, 70, 90, 65, 90, 85, 50.5] << - grades =

100

100

90

40

80

100

85

70

90

65

90

85

50.5

1045.5 << - Sum of the grades

80.4230769231 << - Average

334.071005917 << - Variance

18.2776094147 << - Standard Deviation

[100, 100, 90, 40, 80, 100, 85, 70, 90, 65, 90, 85, 50.5] << -- grades variable to make sure it wasn't damaged

None

My code follows:

grades = [100, 100, 90, 40, 80, 100, 85, 70, 90, 65, 90, 85, 50.5]

def print_grades(scores):

for grade in scores:

print grade

return

def grades_sum(scores):

total = 0

for grade in scores:

total += grade

return total

def grades_average(scores):

sum_of_grades = grades_sum(scores)

average = sum_of_grades / float(len(scores))

return average

def grades_variance(scores):

average = grades_average(scores)

variance = 0.00

sc = 0

for score in scores:

variance = variance + (average - score) ** 2

sc += 1

variance = variance / sc

return variance

def grades_std_deviation(variance):

return (variance ** 0.5)

print grades

print_grades(grades)

print grades_sum(grades)

print grades_average(grades)

print grades_variance(grades)

print grades_std_deviation(variance)

print grades