.与均值极差分布相关的值子组容量 Size ( m )234567891011121314151617181920子组数()11.01.414212.01.911552.92.238873.82.481244.72.672535.52.829816.32.962887.03.077947.73.179058.33.269099.03.350169.63.4237810.23.4911610.83.5533311.33.6107111.93.6642212.43.7142412.93.7611813.43.8053721.91.279313.81.805385.72.150697.52.404849.22.6043810.82.7677912.32.9056213.8