在下列各向量中,____是概率向量。()
A.(0.6,0.2,0.02,0.21) B.(0.3,0.3,0.28,0.12) C.(0.15,0.25,0.5,0.11) D.(0.18,0,0.39,0.40)
◎欢迎参与讨论,请在这里发表您的看法、交流您的观点。