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Old 04-08-2012, 03:30 AM
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htlin htlin is offline
Join Date: Aug 2009
Location: Taipei, Taiwan
Posts: 610
Default Re: question about probability

Originally Posted by canon1230 View Post
If an urn contains 100 green or red marbles, and you sample 10 and they are all green, what is the probability that they are all green?
The short reply is that probability does not tell us this answer, unless there are more assumptions.

Put it to the simplest case, if you flip a coin and get a head, what is the head probability of the coin? The answer can be "any non-zero number" but there is no further information to pin it down.

Hope this helps.
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