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hw3_new_new - IEOR 130 Spring 2009 Prof Leachman Homework#3...

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1 IEOR 130 Spring, 2009, Prof. Leachman Homework #3 due Thursday Feb. 26 1. The average rework rate for photolithography at a particular fab is 4%. Recent data on the photo rework is as follows. Shift # # of wafers # of wafers processed reworked 1 500 20 2 650 39 3 550 36 4 600 18 During which shifts was photo rework in statistical control? 2. Speedy Micro Devices Co. (SMD) fabricates microprocessor chips. SMD sells the microprocessor in three speeds: 300 megahertz ("Bin 1"), 233 megahertz ("Bin 2"), and 150 megahertz ("Bin 3"). The selling prices are $200 per chip for 300 mHz chips, $50 per chip for 233 mHz chips and $10 per chip for 150 mHz chips. These three chip types are actually different grades of quality of a single SMD chip type that is fabricated. All chips on each completed SMD wafer are tested. Assume exactly 100 die per wafer function correctly, but the speed of each functioning chip is a random variable. Assume the speed is checked for all 100 functioning die per wafer at SMD. Chips operating at 300 mHz are better are classified as "Bin 1" chips; chips operating between 233 and 300 mHz are classified as "Bin 2" chips; chips operating between 150 mHz and 233 mHz are classified as "Bin 3" chips; and chips operating slower than 150 mHz are considered scrap.
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