Before a Marketing Research Study Was Done, John Colorado Believed

Short Answer

Before a marketing research study was done, John Colorado believed there was a 50/50 chance that his music store would be a success.The research team determined that there is a 0.9 probability that the marketing research will be favorable given a successful music store.There is also a 0.8 probability that the marketing research will be unfavorable given an unsuccessful music store.
(a)If the marketing research is favorable, what is the revised probability of an unsuccessful music store?
(b)If the marketing research is unfavorable, what is the revised probability of an unsuccessful music store?