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The lifetime of a specific brand of alkaline battery used in a smoke alarm is normally distributed with a mean of 4000 hours and

The lifetime of a specific brand of alkaline battery used in a smoke alarm is normally distributed with a mean of 4000 hours and a standard deviation of 600 hours. Find the percentage of batteries that will last between 4,120 and 4,720 hours. 18) a. 60% b. 30.6% C. 46.4% d. 19.4% e. 6%

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