A certain brand of automobile tire has a mean life span of 32,000 miles and a standard deviation of 2,100 miles. (Assume the life spans of the tires have a bell-shaped distribution.) (a) The life spans of three randomly selected tires are 35,000 miles, 36,000 miles, and 31,000 miles. Find the z-score that corresponds to each life span. For the life span of 35,000 miles, z-score is (Round to the nearest hundredth as needed.)

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