A multiple-channel queuing system with a Poisson arrival rate and an exponential service time has an average arrival rate of 4 customers per hour and an average service time of 18 minutes per customer. The minimum number of servers required to avoid an overloaded system is .A) 1
B) 2
C) 3
D) 4

minimum number of server is = 2

so correct option is B) 2

Explanation:

given data

customers = 4

service time = 18 minutes per customer =  hr = 0.3 hr

to find out

minimum number of server    

solution

we get here first min servers that is

min servers = 4 × 0.3  

min servers = 1.2

so here minimum number of server is = 2

servers cant be in fractions ( as only whole number of server is possible)

so correct option is B) 2

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