Mean[list]list の要素の統計的平均値を与える．
Mean[dist]記号的分布 dist の平均値を与える．
数値の平均：
記号値の平均：
各列の要素の平均：
記号対数正規分布の平均値を与える：
Total StandardDeviation Variance Median RootMeanSquare TrimmedMean GeometricMean HarmonicMean ContraharmonicMean MeanDeviation Standardize Rescale Commonest Expectation MeanFilter
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