A human resources manager at Beta Technologies, Inc., has collected current annual salary figures and related data for 52 of the company’s full-time employees. The data are in the file P4_3.XLS. Specifically, these data include each selected employee’s gender, age, number of years of relevant work experience prior to employment at Beta, the number of years of employment at Beta, the number of years of post-secondary education, and annual salary. How much of this data set is usable? Clean all usable data.