Z= X+ Y的概率密度函数f(z)=?答:X,Y相互独立,且都服从[0,1]上的均匀分布 --> f(x,y)=1.Z=X+Y F(z)=P(x+y<z) = ∫∫f(x,y)dxdy = ∫∫dxdy =直线x=0,x=1,y=0,y=1,y=-x+z所围面积 当0<z<1时, F(z) = (z^2)/2 当1<z<2时, F(z) = (z^2/2)-(z-1)^2 Z=X+Y的概率密度 f(z...
...且都服从[0,1]上的均匀分布,求Z=X+Y的概率密度函数答:X,Y相互独立,且都服从[0,1]上的均匀分布 --> f(x,y)=1.Z=X+Y F(z)=P(x+y<z) = ∫∫f(x,y)dxdy = ∫∫dxdy =直线x=0,x=1,y=0,y=1,y=-x+z所围面积 当0<z<1时, F(z) = (z^2)/2 当1<z<2时, F(z) = (z^2/2)-(z-1)^2 Z=X+Y的概率密度 f(z...