In many settings, the "rules of probability" are just basic facts about percents. The Graduate Management Admission Test (GMAT) Web site provides the following information about the undergraduate majors of those who took the test in 2009–2010: 53% majored in business or commerce; 17% majored in engineering; 16% majored in the social sciences; 6% majored in the sciences; 5% majored in the humanities; and 3% listed some major other than the preceding.3 (a) What percent of those who took the test in 2009–2010 majored in either engineering or science? Which rule of probability did you use to find the answer? (b) What percent of those who took the test in 2009–2010 majored in something other than business or commerce? Which rule of probability did you use to find the answer?