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March 30, 2017

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I do not understand how to figure out probability.

Lee has an urn with 8 white marbles and 10 black marbles. A marble is drawn at random and not replaced. Then a second marble is drawn randomly. What is the probability that the first is white and the second is black?

  • Algebra 1 - ,

    prob(1st is white) = 8/18
    there are now 17 left of which 10 are black , so
    prob(2nd black) = 10/17

    so prob (of your event) = (8/18)(10/17) = 40/153

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