A manufacturer of disk drives for notebook computers wants a MTBF of at least 50,000 hours. Recent test results for 15 units were one failure at 12,000 ​hours, one 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​ = ​% ​(enter your response as a percentage rounded to one decimal​ place).

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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 15 units were one failure at 12,000 ​hours, one 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​ = ​% ​(enter your response as a percentage rounded to one decimal​ place).
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