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A certain brand of automobile tire has a mean life span of 35,000 miles and a standard deviation of 2250 miles. If the life spans

A certain brand of automobile tire has a mean life span of 35,000 miles and a standard deviation of 2250 miles. If the life spans of three randomly selected tires are 34,000 miles, 37,000 miles, and 31,000 miles. Find the z-scores that correspond with each of these mileages. Would the life spans of any of the tires be considered unusual?

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