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4. (20 points) The joint probability density function ofX and Y is given by 6 x f(x,y)=(x2+y) 0 Y). b) (10 points) Find EX and

4. (20 points) The joint probability density function ofX and Y is given by 6 x f(x,y)=(x2+y) 0 Y). b) (10 points) Find EX and EY

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