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Company XYZ know that replacement times for the DVD players it produces are normally distributed with a mean of 10.4 years and a standard deviation

Company XYZ know that replacement times for the DVD players it produces are normally distributed with a mean of 10.4 years and a standard deviation of 1.4 years. If the company wants to provide a warranty so that only 0.9% of the DVD players will be replaced before the warranty expires, what is the time length of the warranty?

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