I'm not sure what's wrong with my code could someone please help?

The console window says:
Traceback (most recent call last):
File "python", line 36, in
NameError: name 'variance' is not defined

print print_grades(grades)
print grades_sum(grades)
print grades_average(grades)
print grades_variance(grades)
print grades_std_deviation(variance)


There is mistake in line 36 or see before that. Check again your "variance" variable. It could be you did not defined or misspelled it.


rades = [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):
average = grades_sum(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 = variance / float(len(scores))
return variance

def grades_std_deviation(variance):
return variance ** 0.5

variance = grades_variance(grades)

print "The class grades are:"
print print_grades(grades)
print "The sum of all grades in the class is", grades_sum(grades)
print "The class average is", grades_average(grades)
print "The grade variance is", grades_variance(grades)
print "Standard deviation is", grades_std_deviation(variance)


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