Thread: Probability help

A survey involving 600 likely Democratic voters and 200 likely Republican voters asked the question: Do you support or oppose legislation that would require trigger locks on guns, to prevent misuse by children? The results are displayed in the table below. If a randomly chosen respondent in the survey answered "support," what is the probability that he or she is a likely Republican voter? (Round your answer to three decimal places.)

support 85% republicans 72% Dem
oppose 8% 17%
Dont Know/refused 7% 11%

Originally Posted by Dadillar

A survey involving 600 likely Democratic voters and 200 likely Republican voters asked the question: Do you support or oppose legislation that would require trigger locks on guns, to prevent misuse by children? The results are displayed in the table below. If a randomly chosen respondent in the survey answered "support," what is the probability that he or she is a likely Republican voter? (Round your answer to three decimal places.)

support 85% republicans 72% Dem
oppose 8% 17%
Dont Know/refused 7% 11%

Draw a tree diagram (the first two branches are R and D). It should then be clear that