Oops, try again. It looks like not all grades were printed! Make sure you are printing ech one on their own line.
I don't get the error msg
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(grades): average = grades_average(grades) variance = 0 for grade in grades: variance += (average - grade) ** 2 variance /= float(len(grades)) return variance def grades_std_deviation(variance): x = variance ** 0.5 return x variance = grades_variance(grades) print "all of the grades: ", grades print "sum of grades: ", grades_sum(grades) print "average grade: ", grades_average(grades) print "variance: ", grades_variance(grades) print "standard deviation: ", grades_std_deviation(variance)