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1. Key in the program and press CLEAR .
2. Key in the number of servers, n and press 0 7.
3. Key in the arrival rate of customers, λ, and press 8.
4. Key in the service rate of each server, µ, and press 9.
5. Press 0 to calculate and store ρ, the intensity factor.
6. Press to see T
q
, the average waiting time in the queue. Display P
0
,
probability that all servers are idle, by pressing 1. Display P
b
,
probability that all servers are busy by pressing 2. Display L
q
,
average number waiting in the queue by pressing 3. Display L, the
average number in the system (waiting and being served), by pressing
4. Display T, average total time through the system, by pressing
5. T
q
, the average waiting time in the queue, may again be
displayed by pressing 6.
7. If desired, calculate P(t), the probability of waiting longer than a given time,
by keying in the time and pressing .
8. Repeat step 7 for other times of interest.
Example 3: Using the data from example 1 of the keystroke solutions
verify the data obtained. In addition, obtain P
0
, the probability that none of
the tellers are busy, and P
b
the probability that all the tellers are busy.
What is the probability that a customer will have to wait 2 minutes or
more?
R
7
: n R
8
: λ
R
9
: µ R
.0
: ρ
R
.1
: Unused
Keystrokes Display
CLEAR
0.00
3 0 7
3.00 n
1.2 8
1.20 λ
.5 9
0.50 µ
0
2.40 ρ
2.16
T
q
average waiting time in queue.
1
0.06
P
0
probability all servers are idle.