The results of CNN's 2008 presidential election poll are given in the table below. (Round your answers to four decimal places.)

Age of voter Obama McCain Other / No Answer

18-29 11.9% 5.8% 0.4%

30-4415.1% 13.3% 0.6%

45-6418.5% 18.1% 0.4%

65 and older7.2% 8.5% 0.3%

(a) Find the probability that a voter is under 30, given that the voter voted for McCain.

(b) Find the probability that a voter is 30 or over, given that the voter voted for McCain.