Suppose that Dunlop Tire manufactures a tire with a lifetime that approximately follows a normal disttribution with mean 70,000 miles and standard dev

Suppose that Dunlop Tire manufactures a tire with a lifetime that approximately follows a normal disttribution with mean 70,000 miles and standard deviation 4,400 miles.7. What proportion of tires will last at least 75,000 miles?8. What is the probability that a randomly selected Dunlop tire lasts between 65,000 and 80,000 miles?

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