概率论与随机过程16new

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6、}=f(x,y)dxdyG¾¾
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7、Rxe−(u+v)dudv,0≤x≤+∞,0≤y≤+∞=−∞−∞0,otherwise(1−e−x)(1−e−y),0≤x≤+∞,0≤y≤+∞=0,otherwise¾¾
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8、i,Y=yj}=pij,÷vµX∞X∞pij≥0,pij=1i=1j=1¡P{X=xi,Y=yj}=pijǑlÑÅCþ(X,Y)VÇþ¼ê,½¡éÜVÇþ¼ê,٩ټêǑµF(x,y)=P{X≤x,Y≤y}PP=Pxi≤xPyj≤yP{X=xi,Y=yj}=xi≤xyj≤ypij¾¾
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