Question: Is there any help for the following question? The flashlight batteries produced by one of the northern manufacturers are known to have an average life

Is there any help for the following question?

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.

a. 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 52 to 68 hours?

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