If a matrix looks like this .....-3 0 3 <-x ....0 0 0 0.2 y..1 0 0.2 0.1 ....2 0.3 0.2 0 how do u calculate the variance for x, given y = 2? How do u even find the probability function for x in this case with a conditional?
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Do you know how to find the marginals of a Random Variable X (or Y)? What you want to do is not possible otherwise.
You mean the marginal probability? I think you sum the rows and columns in the 3x3 matrix to get that.
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