Answer to Question #65548 in Electrical Engineering for lilonas

Question #65548
Seven terminals in an on-line system are attached to a communications line to the central computer. Exactly four of these terminals are ready to transmit a message. Assume that each terminal is equally likely to be in the ready state (i.e. have a message to transmit). The central computer polls the terminals in a fixed sequence without repetition. Let X be the # of terminals polled until the first ready terminal is located (For example if the second terminal polled is ready, then X=2, etc…) a) Find the PMF (Probability Mass Function) of X b) Find the mean and the Variance of X.
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