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twoski
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Homework Statement
Discrete random variables X and Y , whose values are positive integers, have the joint
probability mass function pXY(x,y) = 2-x-y. Determine the marginal probability mass
functions pX(x) and pY(y). Are X and Y independent? Determine E[X], E[Y], and E[XY].
Homework Equations
Independence is determined by whether p(x,y) = p(x)p(y) for all x and y.
The Attempt at a Solution
My notes don't have much on the topic of determining marginal PMF's using a JPMF... I was hoping someone could point me in the right direction.