```
Here is my code for 9. review the site is saying Traceback (most recent call last):
File "python", line 33, in <module>
NameError: name 'variance' is not defined when it is defined please help
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 x in scores:
variance = variance + ((average - x)**2)
total_variance = variance/ len(scores)
return total_variance
print grades_variance(grades)
def grades_std_deviation(variance):
return varience **0.5
varience = grades_variance(grades)
print grades_std_deviation(variance)
print print_grades(grades)
print grades_sum(grades)
print grades_average(grades)
print grades_std_deviation(variance)
```

# 9. review

**system**#3

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