Miscellaneous 143
REGISTERS
n: Unused i: Unused PV: Unused PMT: Unused
FV: Unused R
0
: K R
1
: P
0
R
2
: P
b
R
3
: L
q
R
4
: L R
5
: T R
6
: Used, T
q
R
7
: n R
8
: λ R
9
: µ R
.0
: ρ
R
.1
: Unused
Program Instructions:
1.
Key in the program and press
fCLEARH.
2.
Key in the number of servers, n and press
?0?7.
RPN Mode:
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
z?.0 to calculate and store ρ the intensity factor.
ALG Mode:
3.
Key in the arrival rate of customers, λ and press
?8z.
4.
Key in the service rate of each server, µ and press
?9.
5.
Press
³?.0 to calculate and store ρ the intensity factor.
6.
Press
t 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
t.
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?
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