Company XYZ know that replacement times for the quartz time pieces it produces are normally distributed with a mean of 11.5 years and a standard deviation of 1.2 years. Find the probability that a randomly selected quartz time piece will have a replacement time less than 9.1 years? Enter your answer accurate to 4 decimal places. P(X 9.1 years) = If the company wants to provide a warranty so that only 0.9% of the quartz time pieces will be replaced before the warranty expires, what is the time length of the warranty? Enter your answer in years, rounded to one decimal place warranty = years

Q: 「+ w(ュ-215+2w)11ニテVる

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