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A mechanic sells a brand of automobile tire that has a life expectancy that is normally​...

A mechanic sells a brand of automobile tire that has a life expectancy that is normally​ distributed, with a mean life of 36 comma 000 miles and a standard deviation of 2400 miles. He wants to give a guarantee for free replacement of tires that​ don't wear well. How should he word his guarantee if he is willing to replace approximately​ 10% of the​ tires?

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