A production line has three machines A, B, and C, with reliabilities of 90, 95, and 94, respectively. The machines are arranged so that if one breaks down, the others must shut down. Engineers are weighing two alternative designs for increasing the line's reliability. Plan 1 involves adding an identical backup line, and plan 2 involves providing a backup for each machine. In either case, three machines (A. B. and C) would be used with reliabilities equal to the original three. a. Compute overall system reliability under Plan 1. (Round your intermediate calculations and final answer to 4 decimal places.) Answer is complete but not entirely correct. Reliability 0.9850 € b. Compute overall system reliability under Plan 2. (Round your intermediate calculations and final answer to 4 decimal places.)
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- A production line has three machines A, B, and C, with reliabilities of .99, .96, and .93, respectively. The machines are arranged so that if one breaks down, the others must shut down. Engineersare weighing two alternative designs for increasing the line’s reliability. Plan 1 involves addingan identical backup line, and plan 2 involves providing a backup for each machine. In either case,three machines (A, B, and C) would be used with reliabilities equal to the original three.a. Which plan will provide the higher reliability?50-Step Assembly Line Consider an assembly line with 50 steps that are carried out sequentially. Each of the 50 steps has a defect probability of 1%. The final product produced on the assembly line is defective if any one of the 50 steps made a defect. At the end of the assembly line there are two operators independently inspecting the product. Each of them is recognizing a defective product with a 90% probability. Assuming that the product is not defective, it is moved to the shipping department. Otherwise, the product is scrapped. Probability that a defective product is produced (independent of the defect being found or not) (in decimal form): What is the probability that a defective product is moved to the shipping department?50-Step Assembly Line Consider an assembly line with 50 steps that are carried out sequentially. Each of the 50 steps has a defect probability of 1%. The final product produced on the assembly line is defective if any one of the 50 steps made a defect. At the end of the assembly line there are two operators independently inspecting the product. Each of them is recognizing a defective product with a 90% probability. Assuming that the product is not defective, it is moved to the shipping department. Otherwise, the product is scrapped. What is the probability that a defective product is produced (independent of the defect being found or not)?
- The president of AS Electronics, Inc., has two design options for his new line of cathode ray tubes (CRTs). The forecast for the CRTs is 100,000 units annually. The company will make 100,000 units using one of the two designs at a cost of $75 each. Good CRTs can be sold, but bad CRTs are destroyed and have no salvage value. (Ignore any disposal cost issues for the moment.) The company can sell good CRTs for $150. Design option A has a .90 probability of yielding 59 good CRTs per 100 and a .10 probability of yielding 64 good CRTs per 100. The design will cost $1,000,000. Design option B has a .80 probability of yielding 64 good CRTs per 100 and a .20 probability of yielding 59 good CRTs per 100. The design will cost $1,350,000. Draw and label the decision tree (for two design options with two possible yields each). Calculate the first-year payoff for each option. [Payoff = Annual Revenues – annual manufacturing costs – design costs] Calculate the expected payoff for each of the…Reinventing the Wheel at Apex Door CompanyJim Delaney, president of Apex Door, has a problem. No matter how often he tells his employees how to do their jobs, they invariably “decide to do it their way,” as he puts it, and arguments ensue between Jim, the employee, and the employee’s supervisor. One example is the door design department, where the designers are expected to work with the architects to design doors that meet the specifications. While it’s not ‘rocket science,’ as Jim puts it, the designers invariably make mistakes-such as designing in too much steel, a problem that can cost Apex tens of thousands of wasted dollars, once you consider the number of doors in, say, a 30-story office tower.The order processing department is another example. Jim has a very specific and detailed way he wants the order written up, but most of the order clerks don’t understand how to actually use the multipage order form. They simply improvise when it comes to a detailed question such as whether…A company owns two adjacent builds, and in each building, there is one piece of equipment that operates separately from one another. Based on past history, equipment 1 is expected to break down 7 times a year, with a variance of 3, and costs $600 per breakdown. equipment 2 is expected to break down 9.2 times per year, with a variance of 2.1, and costing $245 per breakdown. 1. What is the company’s expected cost for equipment breakdowns? 2. What is the variance of the breakdown cost? Provide set up of work to compare notes.
- You have two design options for your new line of high-resolution monitors for Computer-Aided Design (CAD)workstations. The production run is for 110,000 units. Design option A has a .90 probability of yielding 65good monitors per 100 and a .10 probability of yielding 70good monitors per 100. This design will cost $1,000,000. Design option B has a .80 probability of yielding 65good units per 100 and a .20 probability of yielding 60good units per 100. This design will cost $1,350,000. Good or bad, each monitor will cost $75. Each good monitor will sell for $150. Bad monitors are destroyed and have no salvage value. We ignore any disposal costs in this problem. Demonstrate how decision trees can be used in order to choose the design option based on the above situation. Calculate the expected monetary value (EMV) of each option and determine which option you will propose.Statement of the Problem and Solutions Rollin King and Herb Kelleher started Southwest Airlines in 1971 with this idea: if they could take airline passengers where they want to go, on time, at the lowest possible price, and have a good time while doing it, people would love to fly their airline. The result? No other airline in the industry's history has enjoyed the customer loyalty and extended profitability for which Southwest is now famous. The company now flies more than 3,400 times each day to over 64 destinations across the United States There's more to the story, however, than making promises and hoping to fulfill them. A large part of Southwest Airlines' success lies in its ability to plan long-term capacity to better match demand, as also improving the utilization of its fleet by turning around an aircraft at the gate faster than its competitors. Capacity at Southwest is measured in seat miles, and even a single minute reduction in aircraft turnaround time system wide means…Assume that a computer has two 1TB disks, D0 and D1. The Mean Time to Failure (MTTF) ofeach disk is 1M hours.a. If the disk system is configured to have 2TB total storage capacity, when any of the two disksfails, the disk system fails. What is the MTTF of the disk system?b. Mirroring (RAID-1) is a technique can improve the reliability of disk systems by usingredundancy. Each data block will have two identical copies stored in both D0 and D1. Under thisconfiguration, the disk system has only 1TB total storage capacity; but it only fails when bothdisks fail (e.g. when the failed disk is being repaired, the second disk also fails). If the MTTR of afailed disk is 20 hours, what is the MTTF of the disk system now?
- 20-Station Assembly Line Consider an assembly line with 20 stations. Each station has a 0.5% probability of making a defect. At the end of the line, an inspection step singles out the defective units. The inspection step catches 80% of all defects. From inspection, units that are deemed to be non-defective are moved to the shipping department. If a defect is found at inspection, it is sent to the rework department. Rework fixes about 95% of the defective units. Units are directly shipped from the rework department with no further inspection taking place. What is the probability that a unit ends up in rework (in decimal form)?Sigma Airway: In 2021, Sigma Airway was considering the possibility of adding a new economy class to the two existing classes - first class and tourist -in the hope that the total contribution to its profit from fares might be increased. Ms. Somsri, the marketing manager for Sigma had to decide within the next week whether or not to introduce such as a change. If introduced, the new class would have to be retained for at least 100 days. Somsri felt that the essential question to be answered in her analysis was whether such a deal would attract sufficient new customers to offset the loss of revenue from existing tourist customers switching to the lower-contribution economy class. Somsri, having had some experience with these problems in the past, made the following assessments: On an average day she felt that there was a 1 in 3 chance that 200 new customers would be attracted to the new class, a 1 in 3 chance at the figure would be around 100 new customers, and a 1 in 3 chance that it…Bagot Copy Shop has a volume of 125,000 black-and-whitecopies per month. Two salespeople have made presentationsto Gordon Bagot for machines of equal quality and reliability.The Print Shop 5 has a cost of $2,000 per month and a variablecost of $.03. The other machine (a Speed Copy 100 ) will costonly $1,500 per month, but the toner is more expensive, drivingthe cost per copy up to $.035. If cost and volume are the onlyconsiderations, which machine should Bagot purchase?