(Solved): Suppose that the lifetimes of old-fashioned TV tubes are normally distributed with a standard devia ...
Suppose that the lifetimes of old-fashioned TV tubes are normally distributed with a standard deviation of \( 1.1 \) years. Suppose also that exactly \( 35 \% \) of the TV tubes die before 4,5 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.