The lifetime of a specific brand of alkaline battery used in

Last updated: 7/9/2022

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. a. 60% b. 30.6% c. 46.4% d. 19.4% e. 6%