Company XYZ know that replacement times for the portable MP3 players it produces are normally distributed with a mean of 3.8 years and a standard deviation of 0.5 years. Find the probability that a randomly selected portable MP3 player will have a replacement time less than 2.5 years? P(X < 2.5 years) = Enter your answer accurate to 4 decimal places. Answers obtained using exact z-scores or z-scores rounded to 3 decimal places are accepted. If the company wants to provide a warranty so that only 4.5% of the portable MP3 players will be replaced before the warranty expires, what is the time length of the warranty? warranty = years Enter your answer as a number accurate to 1 decimal place. Answers obtained using exact z-scores or z-scores rounded to 3 decimal places are accepted.