A.
B.
C.
D.
[单选题]已知用pH纸测定,氨水溶液的pH值约是( )。A.13B.12C.14D.11
[单选题]设总体X~N(),x1,x2,…,x10为来自总体X的样本,为样本均值,则( )A.B.C.D.
[B单选题]前述汽车损失分布的标准差为()。A.400B.16000C.D.160000
[B单选题]前述汽车损失分布的变异系数为()。A.4/5B.3/4C.4/3D.
[单选题]A.203.99B.224.39C.315.30D.530.00
[单选题]A.775.96B.735.26C.685.56D.721.65
[单选题]A.775.96B.735.26C.685.56D.721.65