Suppose that the lifetimes of old fashioned TV tubes are

Last updated: 8/16/2023

Suppose that the lifetimes of old fashioned TV tubes are normally distributed with a standard deviation of 1 2 years Suppose also that exactly 20 of the TV tubes die before 5 years Find the mean lifetime of TV tubes Carry your intermediate computations to at least four decimal places Round your answer to at least one decimal place years X