The following contingency table shows opinion about global warming among U.S. adults, broken down by political party affiliation (based on a poll in October 2012 by Pew Research found at www.people-press.org/2012/10/15/more-say-there-is-solid-evidence-of-global-warming/).

a) What is the probability that a U.S. adult selected at random believes that global warming is a serious issue?
b) What type of probability did you find in part a?
c) What is the probability that a U.S. adult selected at random is a Republican and believes that global warming is a serious issue?
d) What type of probability did you find in part c?

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Opinion on Global Warming Democratic Republican Independent Total Nonissue Serious Concern Total 500 500 200 1200 85 290 70 445 415 210 130 755