"It looks like not all grades were printed!
Make sure you are printing ech one on their own line."
( ech is a small spelling error in the error message )
I expected it all to print to the console screen
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 score in scores: variance += (average - score) ** 2 result = variance/len(scores) return result print grades_variance(grades) def grades_std_deviation(variance): return variance ** 0.5 variance = 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)