question archive A company knows that replacement times for the quartz time pieces it produces are Normally distributed with a mean of 12 years and a standard deviation of 2
A company knows that replacement times for the quartz time pieces it produces are Normally distributed with a mean of 12 years and a standard deviation of 2
Subject:StatisticsPrice: Bought3
A company knows that replacement times for the quartz time pieces it produces are Normally distributed with a mean of 12 years and a standard deviation of 2.3 years.
Find the proportion of a randomly selected quartz time pieces that will have a replacement time less than 6.7 years?
P(X < 6.7 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 3.8% 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.
