A.0.9,0.09 B.0.9,0.03 C.0.9,0.3 D.0.09,0.3
A.對稱的鐘形分布 B.左偏的鐘形分布 C.右偏的鐘形分布 D.U形分布
A.28.46 B.19.54 C.27.95 D.381.94