{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

hw3_new_new

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

This preview shows pages 1–2. Sign up to view the full content.

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.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern