HP 12C manual 145

What is the average number of customers in the waiting line at any time? The average waiting time? What is the average total time for a customer to wait and be checked out? The average number of customers in the system?

	Keystrokes	Display
.5	1	0.50
.9	2	0.56
	2
1		0.69	Average # customers waiting in
			queue.
	1	1.39	Average waiting time.
	2	2.50	Average total time in the system.
	1	1.25	Average # customers in system.

With an HP-12C program on can readily calculate the necessary probabilities for this type of problem (dispensing with the use of tables) and perform additional calculations as well.

KEYSTROKES		DISPLAY
CLEAR	00-
1	01-		1
0	02-44	33	0
0	03-45	48	0
0	04-	45	0
0	05-		0
	06-	43	34
09	07-43, 33		09
16	08-43, 33		16
	09-		40
	10-		21
	11-	43	36
	12-	43	3
	13-		10

145