SOLUTION: Replacement times for Maytag washer and dryer sets are normally distributed with a mean of 4.8 years and a standard deviation of 1 years. Round all final answers to 3 decimals.

Question 1167640: Replacement times for Maytag washer and dryer sets are normally distributed with a mean of 4.8 years and a standard deviation of 1 years.
Round all final answers to 3 decimals.
(a) Find the replacement time (in years) that separates the top 11 % from the bottom 89 %

(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?
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
z=-1.227 is the 11th percentile.
z=(x-mean)/sd
x-mean=-1.227
x=3.573 years
This is the bottom 2%ile or z=-2.05
same formula above and it would be 2.75 years

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