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The lifetime of a certain type of battery is normally distributed with mean value 13 hours and standard deviation 1 hour There are nine batteries

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The lifetime of a certain type of battery is normally distributed with mean value 13 hours and standard deviation 1 hour There are nine batteries in a package What lifetime value in hours is such that the total lifetime of all batteries in a package exceeds that value for only 5 of all packages Round your answer to two decimal places LAUSE SALT

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