Practice_Midterm

# Practice_Midterm - 1 Mid-term EEE 350, Fall 2011 Answer all...

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Unformatted text preview: 1 Mid-term EEE 350, Fall 2011 Answer all questions. Time for test = 75 minutes. 1) Monitor three phone calls and observe whether each one is a voice call or a data call. The random variable N is the number of voice calls. Assume N has the PMF P N ( n ) = . 1 n = 0 . 3 n = 1 , 2 , 3 otherwise . (1) Voice calls cost 25 cents each and data calls cost 40 cents each. T cents is the cost of the three telephone calls monitored in the experiment. (a) Express T as a function of N . (1 point) (b) Find the PMF of T P T ( t ) . (1 point) (c) Find the CDF of T F T ( t ) . (1 point) (d) Find the mean and variance of T . (2 points) 2) You have two grocery stores – Fry’s and FoodCity – from where you do your groceries. You visit one or the other store and none else. Your past behavior indicates that you are twice as likely to visit Fry’s than FoodCity. At Fry’s the waiting time at the cash counter is a discrete random variable that is uniformly distributed between and 10 minutes. At FoodCity, the waiting time is also a discrete random variable uniformly distributed between...
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## This note was uploaded on 02/11/2012 for the course EEE 352 taught by Professor Ferry during the Spring '08 term at ASU.

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Practice_Midterm - 1 Mid-term EEE 350, Fall 2011 Answer all...

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