Question

Problem 15-31 (Algorithmic)

Mid-West Publishing Company publishes college textbooks. The company operates an 800 telephone number whereby potential adopters can ask questions about forthcoming texts, request examination copies of texts, and place orders. Currently, two extension lines are used, with two representatives handling the telephone inquiries. Calls occurring when both extension lines are being used receive a busy signal; no waiting is allowed. Each representative can accommodate an average of 9 calls per hour. The arrival rate is 17 calls per hour.

a. How many extension lines should be used if the company wants to handle 80% of the calls immediately?

b. What is the probability that a call will receive a busy signal if your recommendation in part (a) is used? If required, round your answer to four decimal places.

c. What number of calls, in decimal form, receive a busy signal for the current telephone system with two extension lines? If required, round your answer to four decimal places.

Answer 1

So calls per hou oo ele shone s ofevafe sho Extensian Jines S comp an unfs hand so/. cal imediat manu fo mua 1-0 (从 bus

2- 1 17x17 14 3-2 62 216 3111 P2 6 3111 3 3 5

דן 3 1 1.02 21 0.912 S. 412 ろ P, =0.1776 나

C.16OS p4F0-1117 6' 31で96 can hanae sof! calls immedi fobai call xeceived bus obaity of 1sexves bus -0.3777