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 Probability and Statistics Basic Probability and Statistics Math Forum

 June 6th, 2011, 01:09 PM #1 Newbie   Joined: Jun 2011 Posts: 1 Thanks: 0 Probability question =.= need help on this one: box # 1 contains 1 purple and 2 pink marbles. box # 2 contains 2 purple and 1 pink marbles. a marble is chosen at random from box #2 and placed in box #1. find the probability of now choosing a pink marble from box #1. so far I think i go with P(box#1/pink) = P(box#1 and pink)/P(pink) using the formula P(E/F)=P(E and F)/P(F) where E represents the location and F represents the item June 6th, 2011, 03:06 PM #2 Global Moderator   Joined: May 2007 Posts: 6,822 Thanks: 723 Re: Probability question =.= I suggest that instead of using formulas mechanically, you try to see what is going on. Step 1: prob(purple is chosen = 2/3, prob (pink is chosen) = 1/3. Step 2: purple chosen in step 1, then prob(pink chosen) = 1/2; pink chosen in step 1, then prob(pink chosen) = 3/4. Put it all together prob(pink in step 2) = 2/3 x 1/2 + 1/3 x 3/4 = 7/12. June 6th, 2011, 08:22 PM #3 Senior Member   Joined: Apr 2007 Posts: 2,140 Thanks: 0 Steps 1 and 2 given by mathman are correct. June 6th, 2011, 11:14 PM   #4
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Re: Probability question =.=

Quote:
 Originally Posted by mathman I suggest that instead of using formulas mechanically, you try to see what is going on.
+1, every formula is derived from the concept for user-friendly. Once you understand, it will be a pleasure. Tags probability, question 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 jskrzy Probability and Statistics 4 October 31st, 2011 02:11 PM skate_rds Advanced Statistics 3 March 17th, 2011 07:37 AM skate_rds Advanced Statistics 0 February 6th, 2011 09:16 PM madflame991 Probability and Statistics 0 February 1st, 2011 01:06 AM tnutty Advanced Statistics 1 January 27th, 2011 04:31 PM

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