Replacement times for Maytag washer and dryer sets are normally distributed with a mean of 4.5 years and a standard deviation of 1.3 years. Round all final answers to 3 decimals. (a) Find the replacement time (in years) that separates the top 10 % from the bottom 90 % . (b) If the manufacturer wants to provide a warranty time so that only 2 % of the washer and dryer sets will be replaced before the warranty expires, what length of time (in years) would you recommend for the warranty