"Oops, try again. The grades variable should contain a list of grades!"
No idea why this is happening. I've looked through archived topics and I just can't figure out why this isn't going through. Seems like everything works but I just don't understand why this error is appearing, I've rewritten the print_grades function countless times.
grades = [100, 100, 90, 40, 80, 100, 85, 70, 90, 65, 90, 85, 50.5] def print_grades(x): for item in x: print item 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 return (variance/(len(scores))) def grades_std_deviation(variance): result = variance**0.5 return result print_grades(grades) print grades_sum(grades) print grades_average(grades) print grades_variance(grades) variance = grades_variance(grades) print grades_std_deviation(variance)