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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
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Re: simple probability question

Quote:
 Originally Posted by giankar 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?
Step 1: Calculate exponent for each of the three cases.
Step 2: Calculate prob. of not working for each tool, call them P, Q, R.
Step 3: Prob. all still working is 1-PQR.

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