Question: Quality-control studies for Speedy Jet computer printers show that the lifetime of the printer follows a normal distribution with mean [I = 4 years and

Quality-control studies for Speedy Jet computer printers show that the lifetime of the printer follows a normal distribution with mean [I = 4 years and standard deviation 0: 0.78 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 10% of the printers? 2

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