Say I have a bag with 10 balls (either red or blue), and I know that there are 8 balls that are red. How do I calculate the probability of drawing a a red ball $>75\%$ of the time if the first ball I picked without replacements is red? Hope this is clear. Thanks!


closed as unclear what you're asking by whuber Feb 24 '14 at 20:50

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  • $\begingroup$ To what "time" do you refer? Does the 75% include the first ball you drew? Do you mean you know exactly eight balls are red or that you know there exist eight red balls in the bag? $\endgroup$ – whuber Feb 24 '14 at 20:09
  • $\begingroup$ thanks your question was enough to answer my original question. I was not thinking straight by not defining time correctly. $\endgroup$ – Ahdee Feb 24 '14 at 20:18