One operation of a mill is to cut pieces of steel into parts that will later be used as the frame for front seats in an automobile. The steel is cut with a diamond saw and requires the resulting parts to be within {0.005 inch of the length specified by the automobile company. The measurement reported is the difference in inches between the actual length of the steel part, as measured by a laser device, and the specified length of the steel part. For example, the first value, -0.002, represents a steel part that is 0.002 inch shorter than the specified length. Data are collected from a sample of 100 steel parts and stored in Steel.

a. Construct a percentage histogram. 

b. Is the steel mill doing a good job meeting the requirements set by the automobile company? Explain.