Question
Consider the discrete random variables X and Y whose joint distribution is given
in the following table, so P(X = -1 and Y = -1) = 1/2, P(X= -1 and Y = 1) = 0, etc.
Y= -1
Y= 1
X= -1
X= 1
a) What is the marginal distribution of X? What is the marginal distribution of Y?
b) Compute E(X) and E(Y).
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Transcribed Image Text

Consider the discrete random variables X and Y whose joint distribution is given in the following table, so P(X = -1 and Y = -1) = 1/2, P(X= -1 and Y = 1) = 0, etc. Y= -1 Y= 1 X= -1 X= 1 a) What is the marginal distribution of X? What is the marginal distribution of Y? b) Compute E(X) and E(Y).

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