求二维联合概率密度函数具体题目如下：（英文的,Suppose that a point (X,Y) is chosen at random from the rectangle S defined as follows:S={(x,y):0
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随机取就是每点被取到可能性相同,是均匀分布
如图,有不清楚请追问.请及时评价.
求二维联合概率密度函数具体题目如下：（英文的,Suppose that a point (X,Y) is chosen at random from the rectangle S defined as follows:S={(x,y):0(图1)