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8. A manufacturer offers a warranty on its coffee makers. The coffee makers have a mean lifespan years, with a standard deviation of 0.7 years.

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8. A manufacturer offers a warranty on its coffee makers. The coffee makers have a mean lifespan years, with a standard deviation of 0.7 years. For how long should the coffee makers be covered warranty, if the manufacturer wants to repair no more than 2.5% of the coffee makers

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