I hate Statistics.
Two independant events are such that P(A)=0.2, P(B)=0.25, P(AuB)=0.4, P(AnB)=0.05
All I have to figure out is:
Given that exactly one event has occured, find the probablity that A occurs.
I know the formula for given is P(X|Y)=P(XnY)/P(Y) and the answer is 0.2*0.75/0.35
I just want to know where each of the numbers come from. Mainly the 0.75. Thanks.