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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!

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

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

  • $\begingroup$ 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