13-41. Cooper Manufacturing has a contract with the U.S. Air Force to produce a part for a new fighter plane being manufactured. The part is a bolt with specifications requiring that the length be normally distributed with a mean of 3.05 inches and a standard deviation of 0.015 inch. As part of the company's quality-control efforts, each day Cooper's engineers select a random sample of 100 bolts produced that day and carefully measure the bolts to determine whether they meet the specifications. The following data were collected yesterday: