Writing a GuaranteeYou sell a brand of automobile tire that has a life expectancy that is normally distributed, with a mean life of 30,000 miles and a standard deviation of 2500 miles. You want to give a guarantee for free replacement of tires that do not wear well. You are willing to replace approximately 10% of the tires. How should you word your guarantee?

Tires that wear out by?? miles will be replaced free of charge.Round to the nearest whole number.