The data file named sat.dat on the Web site contains data on SAT scores for all 50 states as well as the amount of money spent on education, and the percentage of students taking the SAT in that state. (The data are described in Appendix Data set.) Draw a histogram of the Combined SAT scores. Is this distribution normal? The variable adjcomb is the combined score adjusted for the percentage of students in that state who took the exam. What can you tell about this variable? How does its distribution differ from that for the unadjusted scores?