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(Solved):   The Robotics Manufacturing Company operates an equipment repair business where emergency job ...



 

The Robotics Manufacturing Company operates an equipment repair business where emergency jobs arrive randomly at the rate of two jobs per 8-hour day. The company's repair facility is a single-server system operated by a repair technician. The service time varies, with a mean repair time of 2.8 hours and a standard deviation of 2.0 hours. The company's cost of the repair operation is $29 per hour. In the economic analysis of the waiting line system, Robotics uses $38 per hour cost for customers waiting during the repair process.

(a)

What are the arrival rate and service rate in jobs per hour? (Round your answers to four decimal places.)

???? =

???? =

(b)

Show the operating characteristics. (Round your answers to four decimal places. Report time in hours.)

Lq

L

Wq

W

Show the total cost per hour. (Express the total cost per hour in dollars. Round your answer to the nearest cent.)

TC = $ 

(c)

The company is considering purchasing a computer-based equipment repair system that would enable a constant repair time of 2.8 hours. For practical purposes, the standard deviation is 0. Because of the computer-based system, the company's cost of the new operation would be $32 per hour. What effect will the new system have on the waiting line characteristics of the repair service? (Round your answers to four decimal places. Report time in hours.

Wq=

W=

Show the total cost per hour. (Express the total cost per hour in dollars. Round your answer to the nearest cent.)

TC = $ 

(d)

Does paying for the computer-based system to reduce the variation in service time make economic sense? The firm's director of operations rejected the request for the new system because the hourly cost is $3 higher and the mean repair time is the same. Do you agree? How much (in dollars) will the new system save the company during a 40-hour work week? (Round your answer to the nearest cent. Enter 0 if there are no savings.)



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a) ? = 2/8 = 0.25 ? = 1/3 = 0.33 b) lnterarriva l time a = 4 hours Std dev of interriva l time Oa = 4 hours Processing time p = 3 hours St
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