Mathematics, 20.11.2019 22:31, sugar75

Quality control studies for speedy jet computer printers show the lifetime of the printer follows a normal distribution with mean = 4 years and standard deviation = 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?

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Quality control studies for speedy jet computer printers show the lifetime of the printer follows a...