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) final_variance=variance/float(len(scores)) return final_variance print grades_variance(grades) def grades_std_deviation(variance): return variance**0.5 variance = grades_variance(grades) print grades_st_deviation(variance)
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