According to the book the answers are 12.14 A PBX provides queuing and automatic call back for access to outgoing WATSlines. If there are 20 requests per hour for the WATS lines, and if the averagecall is 3 min in length, how many WATS lines are needed to provide delays ofless than 1 hr for 90% of the requests?

Given Information:Requests per hour (λ) = 20 calls per hourAverage call duration (T) = 3 minutes =…

Answered: 12.14 A PBX provides queuing and…

Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)

10th Edition

ISBN:9781337399128

Author:Russell E. Smith

Publisher:Russell E. Smith

Chapter17: Commercial And Industrial Air-conditioning Control Systems

Section: Chapter Questions

Problem 25RQ

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12.14 A PBX provides queuing and automatic call back for access to outgoing WATS lines. If there are 20 requests per hour for the WATS lines, and if the average call is 3 min in length, how many WATS lines are needed to provide delays of less than 1 hr for 90% of the requests?