The average life of an automobile tire of a certain manufacturer follows a Normal distribution, with a mean of 32,000 miles and a standard deviation of 1,250.
Use the z-table to answer the question.
What tire life span separates the upper 30% of the life spans from the lower 70% of the life spans?
31,344 miles
32,650 miles
32,875 miles
33,250 miles
