User Manual

R
7
: n
R
8
: λ
R
9
: µ R
.0
: ρ
R
.1
: Unused
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?
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.