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Company XYZ know that replacement times for the quartz time pieces it produces are normally distributed with a mean of 13.2 years and a standard deviation of 1.7 years.
Find the probability that a randomly selected quartz time piece will have a replacement time less than 9.8 years?
P(X < 9.8 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 1.8% 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 exact z-scores or z-scores rounded to 3 decimal places are accepted.
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