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2. The flashlight batteries produced by one of the northern manufacturers are known to have an average life of 60 hours with a standard deviation

2. The flashlight batteries produced by one of the northern manufacturers are known to have an average life of 60 hours with a standard deviation of 4 hours. Please use Chebyshev's theorem to answer the following questions. At least what percentage of flashlights will have a life of 55 to 65 hours? b . At least what percentage of the batteries will have a life of 50 to 70 hours?

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