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You are a manufacturer of chain saws and are prepared to replace (for free) all saws that fail while under guarantee. If you are willing

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You are a manufacturer of chain saws and are prepared to replace (for free) all saws that fail while under guarantee. If you are willing to replace only 3% of the saws that fail, how long a guarantee should you offer? Assume that you know that the lives of the saws follow a normal distribution with a mean of 12 years and a standard deviation of 2 years

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