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 June 10th, 2009, 02:37 AM #1 Newbie   Joined: Jun 2009 Posts: 2 Thanks: 0 Probability Hi, easy question but I need someone to verify that this is right! The probability that A will die within the next 10 years is 0.1 and the probability that B will die within the next 10 years is 0.2. What is that probability that, if one dies, it will be A? I used a karnaugh table to work it out, and interpreted "if one dies" as meaning "if only one dies", and my answer was4/13. Is this correct? Thanks! June 10th, 2009, 03:18 AM #2 Newbie   Joined: Jun 2009 Posts: 3 Thanks: 0 Re: Probability i would say 1/3 P(A_dies)/P(A_or_B_dies) 0.1/(0.1+0.2) June 10th, 2009, 03:10 PM #3 Newbie   Joined: Jun 2009 Posts: 2 Thanks: 0 Re: Probability Thanks 100dollars So does this mean you've interpreted "one dies" as "one or both die"? June 11th, 2009, 04:51 AM #4 Newbie   Joined: Jun 2009 Posts: 3 Thanks: 0 Re: Probability no. i interpreted it 'if only one dies'. event : A or B dies P(A U B) = 0.3 P(A|A U B) = P(A intersection (A U B)) / P(B) = P(A) / P(B) = 1/3 // EDIT: maybe you are right. i didnt consider the event that both of them dies. then having a state space (A_dies, B_dies, A_and_B_dies) = (0.1 , 0.2, 0.02 ) then P(A_dies) / P(A_dies U B_dies U A_and_B_dies ) = 0.1/(0.32) = 10/32 = 5/16 what do you think? Write your solution Just one question. This has to do with statistics class right? Because t is written in a way so typical for statistics exercises, where if you only studied probability theory, you really have a hard time finding yourself in it.  Tags probability Thread Tools Show Printable Version Email this Page Display Modes Linear Mode Switch to Hybrid Mode Switch to Threaded Mode Similar Threads Thread Thread Starter Forum Replies Last Post hbonstrom Applied Math 0 November 17th, 2012 07:11 PM token22 Advanced Statistics 2 April 26th, 2012 03:28 PM naspek Calculus 1 December 15th, 2009 01:18 PM

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