How long printers guaranteed if company replace

Reference no: EM13118564

Quality control studies for speedy jet computer printers show the lifetime of the printer follows a normal distribution with a mean of 4 years and a standard deviation of .78 years. The company will replace any printer that fails during the guarantee period. How long should speedy jet printers be guaranteed if the company wishes to replace no more than 15% of the printers?

Reference no: EM13118564

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