how to tell when something is jointly normal where is $(x,y)$ jointly normal and not normal when is x and y normal when is $(X)% normal? when is the condition that $(x,y)$ is jointly normal what condition for x/y to be normal what is jointly normal given that $y$ and $y$ are normal? what is the normal condition for $(x,y)$ when is $(x,y)$ jointly normal when is x and y normal when is the condition of $(x,y), y-y normal where is the condition $(x, y)$ to be jointly normal? when is $(x, y)$ jointly normal given that both $X$ and $Y$ are normal? when are $(x, y)$ jointly normal when is $(x y)$ jointly normal when is $x, y normal what is the condition for y to be normal? when are x y and y normal when is $(x)y together normal why is y considered normal