The mean tread life of a tire is 30,000 miles with a standard deviation of 2000 miles. Tire tread life is normally distributed. b) What percent of tire treads will last less than 28,000 miles?
c) What percent of tire treads will last between 26,000 and 32,000 miles?
d) What percent of tire treads will last more than 34,000 miles?