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July 3rd, 2011, 01:01 PM  #1 
Newbie Joined: Jun 2011 Posts: 9 Thanks: 0  Probability Question
If Pr[E] = 1/4 and Pr[F] = 1/5 If it is known that when event F occurs, event E is 3 times more likely to occur than not to occur, find Pr[Fc  Ec]. Do we have to show that event E is 3 times likely to occur than not to occur even though when we are finding Pr[Fc  Ec] and event F doesn't occur? Also how do we go about solving this question? Thanks! 
July 3rd, 2011, 01:35 PM  #2 
Newbie Joined: Jun 2011 Posts: 9 Thanks: 0  Re: Probability Question
Also if two events are mutually exclusive, is it possible for neither of them to occur? I know that they both can't occur at the same time. Once again, thanks! 
July 3rd, 2011, 03:10 PM  #3  
Senior Member Joined: Feb 2010 Posts: 714 Thanks: 151  Re: Probability Question Quote:
 
July 3rd, 2011, 06:56 PM  #4  
Senior Member Joined: Apr 2011 From: USA Posts: 782 Thanks: 1  Re: Probability Question
I went about this a completely different way, but got the same answer. So to answer your other questions: Quote:
Quote:
 
July 4th, 2011, 05:47 AM  #5 
Newbie Joined: Jun 2011 Posts: 9 Thanks: 0  Re: Probability Question
Thank you so much mrtwhs and Erimess! This really helped me understand these type of probability questions and I was able to solve the rest of them fairly easily by understanding how you guys approached it.


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