Question: The mean life of a certain computer hard disk in continual use is 8 years. (a) How long a warranty should be offered if the

The mean life of a certain computer hard disk in continual use is 8 years.
(a) How long a warranty should be offered if the vendor wants to ensure that not more than 10 percent of the hard disks will fail within the warranty period?
(b) Not more than 20 percent?

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