A mechanic sells a brand of automobile tire that has a life expectancy that

is normally​ distributed, with a mean life of 

33 comma 000

miles and a standard deviation of 

2500

miles. He wants to give a guarantee for free replacement of tires that​don’twear well. How should he word his guarantee if he is willing to replace approximately​10%of the​tires?

Tires that wear out by 

nothing

miles will be replaced free of charge.

​(Roundto the nearest mile as​needed.)

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