The mean lifetime of a certain tire is 30,000 miles and the standard deviation is 2500 miles. If we assume the mileages are normally distributed, approximately what percentage of all such tires will last between 22,500 and 37,500 miles?

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I need to use the empyrical rule

(22500-30000)/2500
(37500-30000)/2500
What are these and what do these values tell us?

Um they tell us the mileage of the tire?

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