A.32*σ2+σ2B.32*σ2*σ2C.(3L1)2*σ2+(3L2)2*σ2D.
A.2mmB.4mmC.8mmD.4cm
A.權(quán)陣中主對(duì)角線元素為各隨機(jī)變量的權(quán)B.權(quán)陣中主對(duì)角線元素為各隨機(jī)變量的協(xié)因數(shù)C.若權(quán)陣為對(duì)角陣時(shí),其主對(duì)角線元素即為各隨機(jī)變量的權(quán)D.若權(quán)陣為對(duì)角陣時(shí),其主對(duì)角線元素即為各隨機(jī)變量的協(xié)因數(shù)