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)

//// = indention because i don't know how else to show where indented

This code returns with the error "Oops, try again. grades_variance([0, 7, 6, 1, 4, 9, 2, 0]) returned 1.740537242 instead of the expected: 10.234375"

I'm not sure why this is occurring and don't know how to fix it. Can someone plz tell me how I can fix it