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December 1st, 2009, 11:49 AM  #1 
Newbie Joined: Dec 2009 Posts: 2 Thanks: 0  simple probability question
Hey guys, great forum! I've got a problem: I own 3 tools, which have average time of life 4, 6 and 8 days (exponential distribution). How can I find the probability that these tools are working after 2 days? 
December 1st, 2009, 01:21 PM  #2  
Global Moderator Joined: May 2007 Posts: 6,766 Thanks: 698  Re: simple probability question Quote:
Step 2: Calculate prob. of not working for each tool, call them P, Q, R. Step 3: Prob. all still working is 1PQR.  

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