Company XYZ know that replacement times for the quartz time pieces it produces are normally distributed with a mean of 14.7 years and a standard deviation of 2.2 years.

Find the probability that a randomly selected quartz time piece will have a replacement time less than 9.4 years?

P(X< 9.4 years) =

Enter your answer accurate to 4 decimal places. Answers obtained using exactz-scores orz-scores rounded to 3 decimal places are accepted.

If the company wants to provide a warranty so that only 2.6% of the quartz time pieces 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 exactz-scores orz-scores rounded to 3 decimal places are accepted.