Hi, I have this code:

```
grades = [100, 100, 90, 40, 80, 100, 85, 70, 90, 65, 90, 85, 50.5]
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
variance = variance/len(scores)
return variance
print grades_variance(grades)
```

**I get this message**:

grades_variance([4, 0, 5, 1]) returned 1.0595703125 instead of the expected: 4.25

What I’m I missing from the code.

Thanks!