The following contingency table shows opinion about global warming (nonissue vs. serious concern) among registered voters, broken down by political party affiliation (Democratic, Republican, and Independent). Use the table to answer a) through d) below. Opinions on Global Warming Nonissue Serious Concern Total Democratic Political Party Republican 40 270 Independent 80 460 500 230 500 120 200 Total 390 810 1200 a) What is the probability that a registered voter selected at random believes that global warming is a serious issue? The probability is . (Round to three decimal places as needed.)