Company XYZ know that replacement times for the quartz time pieces it produces are normally distributed with a mean of 12 years and a standard...
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Company XYZ know that replacement times for the

quartz time pieces it produces are normally distributed with a mean of 12 years and a standard deviation of 0.9 years.


If the company wants to provide a warranty so that only 2.4% of the quartz time pieces will be replaced before the warranty expires, what is the time length of the warranty?

warranty

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