A aburchett New member Joined Jan 19, 2011 Messages 48 Feb 9, 2011 #1 Given that P(A) = 0.5 and P(B) = 0.3, and P(A and B) = 0.21, determine P(B|A). My work: P(B|A)=P(A?B)/P(A) = 0.21/.5 =.42 Is this correct?

Given that P(A) = 0.5 and P(B) = 0.3, and P(A and B) = 0.21, determine P(B|A). My work: P(B|A)=P(A?B)/P(A) = 0.21/.5 =.42 Is this correct?

tkhunny Moderator Staff member Joined Apr 12, 2005 Messages 9,832 Feb 9, 2011 #2 Looks like it to me. You need a hat full of colored socks to test out your conjectures.