Payscale.com tracks the graduates of all institutions of higher education and determines the return on investment (ROI) of the school's graduates. ROI can be thought of as the investment return on the expenses associated with attending college. Go to www.pearsonhighered.com/sullivanstats and download the file 2_2_43. Construct a relative frequency histogram of the data. Comment on what you notice based on the graphical summary.