<PRE><B>Question 608729</B>
You are presented with three urns. Each urn has 10 marbles. In addition, each urn holds only black or red marbles. Urn 1 has 3 red marbles. Urn 2 has 8 red marbles. Urn 3 has 5 red marbles. You randomly pick 1 marble from 1 of the three urns. Calculate the probability that it is a black marble. Round answer to the nearest hundredth.
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total # of marbles: 30
total # of black marbles: 7 + 2 + 5 = 14 
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P(slect a black) = 14/30 = 7/15
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cheers,
Stan H. 
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