Let X denote the number of times a certain numerical control machine will malfunction: 1, 2, or

Question:

Let X denote the number of times a certain numerical control machine will malfunction: 1, 2, or 3 times on any given day. Let Y denote the number of times a technician is called on an emergency call. Their joint probability is given as
(a) Evaluate the marginal of X.
(b) Evaluate the marginal of V.
(c) Find P(Y = 3 | X = 2).
Distribution
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