def ttal(scores): # scores中の成績の総和を求める s = 0 for i in range(0, len(scores)): s = s + scores[i] return s def average(scores): # scores中の成績の平均を求める return ttal(scores) / len(scores)
def variance(x): s = 0 ave = average(x) for i in range(0, len(x)): s = s + (x[i] - ave) ** 2 return (s / len(x)) def variance2(x): s = 0 for i in range(0, len(x)): s = s + x[i] ** 2 return (s / len(x) - average(x) ** 2)