A certain brand of automobile tires have a life span of 35,000 miles and a standard deviation 2,300 miles (assume tires have a bell-shape distribution)

A) the life span of 3 randomly selected tires are 33,000 miles, 37,000 miles, and 32,000 miles. Find the z-score that correspond to each life span. Round the nearest hundredth as needed.

According to the z-score would the life span of these be considered unusual?