The figure at the left shows a table built by the Queuing
AddIn. The arrival and service rates are in units per hour.
From the information given, answer the questions below.
Quantity

Value

Units 
Arrival Rate when Empty

5

per hour 
Service Rate/Channel

2

per hour 
Number of Channels

2


Max. Number in System

***


Type

M/M/2/5


Mean Number in System

3.277

units 
Mean Number in Queue

1.486

units 
Mean Number in Service

1.791

units 
Throughput Rate

3.582

units/hour 
P(0)

0.046


P(1)

0.116


P(2)

0.145


P(3)

0.182


P(4)

0.227


P(5)

0.284


P(6)

0.000


a. Give the meaning of each the symbols M/M given in the “Type”
line.
b. What proportion of the arriving customers are not served
by this queuing station?
c. For those customers that are served, how long on the average
is the time between when they enter the queue and when they
leave the service?
d. What is the probability that an arriving customer will wait
in the queue?
e. What is the efficiency of the servers?
