Question: solve and explain When someone presses SEND on a cellular phone, the phone attempts to set up a call by transmitting a SETUP message to

solve and explain

When someone presses "SEND" on a cellular phone, the phone attempts to set up a call by transmitting a "SETUP" message to a nearby base station. The phone waits for a response and if none arrives within 0.5 seconds it tries again. If it doesn't get a tesponse after n=4 tries the phone stops transmitting mesages and generates a busy signal. (a) Draw a tree diagram that describes the call setup procedure. (b) If all transmissions are independent and the probubility is 0.85 that a "SETUP" message will get through, what is the PMF of X, the number of messages transmitted in a call attempt? [10+15]

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