The batteries from a certain manufacturer have a mean lifetime of 860 hours with a standard deviation of 90 hours Assuming that

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The batteries from a certain manufacturer have a mean lifetime of 860 hours with a standard deviation of 90 hours Assuming that the lifetimes are normally distributed complete the following statements a Approximately 95 of the batteries have lifetimes between hours and hours b Approximately 1130 hours of the batteries have lifetimes between 590 hours and

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