你可以把这道题答详细吗?设随机变量X1,X2,X3,X4独立同分布,P{Xi=0}=0.6,P{Xi=1}=0.4(i=1,2,3,4)求行...

2024-12-21 16:34:42
推荐回答(3个)
回答1:

Y1=X1X4 Y2=X2X3 Z=Y1-Y2
P{Y1=1}=P{Y2=1}={X2=1,X3=1}=0.16
P{Y1=0}P{Y2=0}=1-0.16=0.84
Z有三种可能-1,0,1
P{Z=-1}={Y1=0,Y2=1}=0.84*0.16=0.1344
P{Z=1}P{Y1=1,Y2=0}=0.16*0.84=0.1344
P{Z=0}=1-2*0.1344=0.7312
Z -1 0 1
P 0.1344 0.7312 0.1344

回答2:

bunen1

回答3:

RGAREG