Question: Let X and Y be continuous random variables with joint density function f X,Y (x,y)=e -5y where y>0, 0

Let X and Y be continuous random variables with joint density function

fX,Y(x,y)=e-5y where y>0, 0

Find E[X|Y=2]

The problem is my prof. said that [The maximum score for a solution that uses integration is 3 points out of 4].

I want to know the way to solve it without using integration

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