Hey everybody, does anybody have an idea where the problem is ?
I get this error message:
TypeError: unsupported operand type(s) for ** or pow(): 'list' and 'float'
, but everything worked fine till now
import math 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) variance= variance/ float(len(scores)) return variance def grades_std_deviation(variance): variance = float(variance **0.5) return variance variance=grades_variance(grades) print print_grades(grades) print "" print grades_sum(grades) print "" print grades_average(grades) print "" print grades_variance(grades) print "" print grades_std_deviation(grades)