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An electric motor manufacturer has stocked 200,000 new motors in the warehouse. In a statistical study a random sample of 250 motors have been tested. The study showed that the motors will on average operate within the specified parameters for 3,500 hours with a standard deviation of 430 hours. It is also assumed that the data is normally distributed. a) Find the approximate number of motors that might work 4,000 hours or more
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An electric motor manufacturer has stocked 200,000 new motors in the warehouse. In a statistical stu...
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