HP 12c Solutions Handbook page 149

R : n
7
R :
9
R : Unused
.1
1. Key in the program and press
2. Key in the number of servers, n and press
3. Key in the arrival rate of customers, , and press
4. Key in the service rate of each server, , and press
5. Press
6. Press
probability that all servers are idle, by pressing
probability that all servers are busy by pressing
average number waiting in the queue by pressing
average number in the system (waiting and being served), by pressing
4. Display T, average total time through the system, by pressing
5. T
displayed by pressing
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
the tellers are busy, and P
What is the probability that a customer will have to wait 2 minutes or
more?
Keystrokes
CLEAR
3 0
1.2 8
.5 9
0
1
0 to calculate and store , the intensity factor.
to see T , the average waiting time in the queue. Display P
q
, the average waiting time in the queue, may again be
q
the probability that all the tellers are busy.
b
Display
0.00
3.00
7
1.20
0.50
2.40
2.16
0.06
R :
8
R :
.0
CLEAR
6.
.
, the probability that none of
0
n
T average waiting time in queue.
q
P probability all servers are idle.
0
148
.
0 7.
8.
9.
1. Display P
b
2. Display L
q
3. Display L, the
,
0
,
,