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Exam_W04_132C

# Exam_W04_132C - Department of Chemical Engineering...

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Department of Chemical Engineering University of California, Santa Barbara Ch.E. 132C Winter, 2004 Final Exam 1. (20 points) A large company purchases a certain type of electronic device from a manufacturer. The manufacturer indicates that the defect rate for the device is 3%. The inspection procedure is to take a random sample of 20 items from a shipment. a. (10 points) What is the probability that there will be at least one defective item in the sample? b. (10 points) Suppose that the company receives 10 shipments and that a random sample of 20 items is selected from each shipment. What is the probability that exactly that 3 of these 10 samples will contain at least one defective device? (That is, the other 7 samples contain no defective devices.) 2. (20 points) The water absorption of a polymer is assumed to be normally distributed. A random sample of three polymers is analyzed and the measured water absorption values are: 1.4%, 2% and 1.8%.

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