a class consists of 55% boys and 45% girls. 25% of the class are boys and scored an A on the test, and 35% of the class are girls that scored an A on the test. if a student is chosen at random and is found to be a girl, what is the probability that the student scored an A

Question

perl · Answer

one minute doing on paper

perl · Answer

P(boy) = .55
P(girl) = .45 
P( boy & scored A)=.25
P( girl & scored A) = .35 
P( girl | scored A ) = P(girl & scored A) / (P( scored A) 

We arent given P( girl & scored A) , but we are given other information.