As part of the annual study of course demands at the university, the registrar computes the average number of credit hours in the natural sciences ( chemistry, biology, geology, etc.) that various majors take during the academic year. The registrar discovers that in 1996, engineering majors enrolled for an average of 15 hours of natural sciences; business majors, 3 hours; psychology majors, 6 hours; and education majors, 4 hours. Construct a bar graph to represent these data