<PLEASE USE THE FOLLOWING TEMPLATE TO HELP YOU CREATE A GREAT POST!>

<Below this line, add a link to the EXACT exercise that you are stuck at.>

https://www.codecademy.com/courses/learn-python/lessons/exam-statistics/exercises/review-2?action=lesson_resume&link_content_target=interstitial_undefined

<In what way does your code behave incorrectly? Include ALL error messages.>

It looks like not all grades were printed! Make sure you are printing each one on their own line.

This is the output:

334.071005917

18.2776094147

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

1045.5

80.4230769231

334.071005917

18.2776094147

<What do you expect to happen instead?>

I don’t know why this isn’t working.

```
def print_grades(grades_input):
for grade in grades_input:
print grade
def grades_sum(scores):
total = 0
for score in scores:
total += score
return total
def grades_average(grades_input):
sum_of_grades = grades_sum(grades_input)
average = sum_of_grades / float(len(grades_input))
return average
def grades_variance(scores):
average = grades_average(scores)
variance = 0
for score in scores:
variance += (average - score) ** 2
total_variance = variance / len(scores)
return total_variance
print grades_variance(grades)
def grades_std_deviation(variance):
deviation = variance ** 0.5
return deviation
variance = grades_variance(grades)
print grades_std_deviation(variance)
print grades
print grades_sum(grades)
print grades_average(grades)
print grades_variance(grades)
print grades_std_deviation(grades_variance(grades))
```