# Pg 1844 4 a broadcasting station has five major

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Pg-184#4-4A broadcasting station has five major subsystems that must all be operational before a show can go onthe air. If each subsystem has the same reliability, what reliability would be required to be 95% certain ofbroadcast success? 98% certain? 99% certain?A.Determining the reliability of the system of component shown below broadcasting station hasfive subsystems5
2 Marks /3Page 185 # 4.13Nora burke travels frequently and relies on her cell phone to keep up to date with clients.Cellular CoMTBFMTTRSYSTEM AVAILABILITY
AIRWAYS102MIN10/ (10+2) =0.83BELLULAR84MIN8/ (8+4) =0.66CYCOMM310MIN3/ (3+10) =0.230System Availability=MTBF/MTBF+MTTRHence, one should go for airways cellular2 Marks /2Service DesignPage 218 #5.7The national Bank of Union city currently has one outside drive-up teller= Arrival Time.= Service Rate.L= Average number of customers.Lq=¿Average number of customers in line.W= Average time spend in queue.Wq= Average waiting time in the line per customer.I=Internal rate?=12 customers per hoursI=3minutes= 60/3=20customers per hourWhere one window, the average time a customer spends waiting in line to be served isWq=208¿μλ=12¿=12/160=0.075/hr0.075*60=4.5mins
Wq=45minsWhen two windows, now the arrivals rate will be divided into2=12/2=6per hourWq=μλ=6/20(20-6)=6/20(14)=0.021*60=1.26min4.5-1.26=3.24 mins reducing in waiting3.24*2000=6480Cost of window=20000So, the second drive-up window should be installed because we alreadyexceeding the survive time by 1.5 minutes. xOne window 12 customers instead of having 20 customersDrive-up window is adequately for the bank.4 Marks /5Page 219 # 5.22This is a Multi Server Model
Compute L, Lq, W, WqMean no of arrivals per time period (

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