f(x,y)=exp(-(x+y)) x>0 y>0 求Z=(X+Y)/2的概率密度.f(x,y)=exp(-(x+y)) x>0 y>0 求Z=(X+Y)/2的概率密度.答案是4zexp(-2z),z>00.其他
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![f(x,y)=exp(-(x+y)) x>0 y>0 求Z=(X+Y)/2的概率密度.f(x,y)=exp(-(x+y)) x>0 y>0 求Z=(X+Y)/2的概率密度.答案是4zexp(-2z),z>00.其他](/uploads/image/z/4375773-45-3.jpg?t=f%28x%2Cy%29%3Dexp%28-%28x%2By%29%29+x%3E0+y%3E0+%E6%B1%82Z%3D%28X%2BY%29%2F2%E7%9A%84%E6%A6%82%E7%8E%87%E5%AF%86%E5%BA%A6.f%28x%2Cy%29%3Dexp%28-%28x%2By%29%29+x%3E0+y%3E0+%E6%B1%82Z%3D%28X%2BY%29%2F2%E7%9A%84%E6%A6%82%E7%8E%87%E5%AF%86%E5%BA%A6.%E7%AD%94%E6%A1%88%E6%98%AF4zexp%28-2z%EF%BC%89%2Cz%3E00.%E5%85%B6%E4%BB%96)
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f(x,y)=exp(-(x+y)) x>0 y>0 求Z=(X+Y)/2的概率密度.f(x,y)=exp(-(x+y)) x>0 y>0 求Z=(X+Y)/2的概率密度.答案是4zexp(-2z),z>00.其他
f(x,y)=exp(-(x+y)) x>0 y>0 求Z=(X+Y)/2的概率密度.
f(x,y)=exp(-(x+y)) x>0 y>0 求Z=(X+Y)/2的概率密度.
答案是4zexp(-2z),z>0
0.其他
f(x,y)=exp(-(x+y)) x>0 y>0 求Z=(X+Y)/2的概率密度.f(x,y)=exp(-(x+y)) x>0 y>0 求Z=(X+Y)/2的概率密度.答案是4zexp(-2z),z>00.其他
4zexp(-2z),z>0