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A manufacturer of disk drives for notebook computers wants a MTBF of at least 50,000 hours. Recent test results for 10 units were one failure

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A manufacturer of disk drives for notebook computers wants a MTBF of at least 50,000 hours. Recent test results for 10 units were one failure at 12,000 hours, two at 20,000 hours, and one more at 48,000 hours. The remaining units were still running at 60,000 hours. Determine the following: a) Percent of failures \=quad (enter your response as a percentage rounded to one decimal place). b) Number of failures per unit-hour of operating time \\( = \\) failures per hour (round your response to eight decimal places)

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