
Probability and Statistics Basic Probability and Statistics Math Forum 
 LinkBack  Thread Tools  Display Modes 
October 13th, 2012, 03:45 AM  #1 
Newbie Joined: Oct 2012 Posts: 4 Thanks: 0  Probability Problem
hello, can you solve this problem: there're 15 bulbs. 3 of them are broken. the bulbs are checked one by one. what's the chance of getting the third broken bulb on the fifth check 
October 13th, 2012, 10:55 AM  #2 
Senior Member Joined: Jul 2012 From: DFW Area Posts: 614 Thanks: 83 Math Focus: Electrical Engineering Applications  Re: Probability Problem
Here are the possible picks and their probabilities: The total is Adding a little intelligence: You have six possibilities. In each numerator there will be because of the 3 bad bulbs that will not be cancelled in the denominator and that will be cancelled because of the 2 good bulbs. In each denominator there will be that will not be cancelled in the numerator and that will be cancelled. 
October 15th, 2012, 01:31 AM  #3 
Newbie Joined: Oct 2012 Posts: 4 Thanks: 0  Re: Probability Problem
Thanks! now can i understand it.. 

Tags 
probability, problem 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Probability Problem / Insurance problem  bsjmath  Advanced Statistics  2  March 1st, 2014 02:50 PM 
Probability problem  ystiang  Advanced Statistics  1  February 13th, 2014 04:27 PM 
Probability problem  halloweengrl23  Advanced Statistics  3  March 23rd, 2012 02:27 AM 
Probability Problem.Please help  adiptadatta  Probability and Statistics  1  May 11th, 2010 06:46 AM 
Help with probability problem!  indian  Algebra  0  February 21st, 2008 04:10 PM 