Y1=X1X4 Y2=X2X3 Z=Y1-Y2P{Y1=1}=P{Y2=1}={X2=1,X3=1}=0.16P{Y1=0}P{Y2=0}=1-0.16=0.84Z有三种可能-1,0,1P{Z=-1}={Y1=0,Y2=1}=0.84*0.16=0.1344P{Z=1}P{Y1=1,Y2=0}=0.16*0.84=0.1344P{Z=0}=1-2*0.1344=0.7312Z -1 0 1P 0.1344 0.7312 0.1344
bunen1
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