Mathematics, 17.07.2019 18:30, KittyLoverCat

1. a type of battery-operated led lights has a known mean lifetime 7.8 hrs with standard deviation 0.2. assuming that the lifetimes of these led lights have a nearly symmetric/bell-curve distribution, find the percent (%) of these led lights having lifetime between 7.6 and 7.8 hours.

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1. a type of battery-operated led lights has a known mean lifetime 7.8 hrs with standard deviation 0...