RecitationThreeSols

# RecitationThreeSols - Rensselaer Electrical Computer and...

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Rensselaer Electrical, Computer, and Systems Engineering Department ECSE 4500 Probability for Engineering Applications Recitation 3 Solutions Wednesday Feb. 10, 2010 Today we will work on the following two exercises from the textbook. (c) What is the probability that the ten dialed numbers consist of six calls to the police, three for an ambulance, and one to the f re department? Note: In the above problem we must assume that the 10 calls are independent, i.e. that they are independently likely to be either of the three alternatives: f re, ambulance, or police. Ans: Let A = {Event that call is to report f re emergency} B = {Event that call is to police} C = {Event that call is for ambulance} We have P [ A ]=0 . 15 ,P [ B . 60 [ C . 25 , and the call sequence 02030202030102030202 contains 1 A ,6 B sand3 C s. Thus the singleton event { BCBBCABCBB

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RecitationThreeSols - Rensselaer Electrical Computer and...

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