Homework Help: statistics

Posted by Emily on Tuesday, December 7, 2010 at 5:11pm.

An Urn contains 7 red and 3 white balls. Two balls are drawn in succession without replacement. If the second ball is white, what is the probability that the first ball was white?

statistics - PsyDAG, Tuesday, December 7, 2010 at 11:37pm
It doesn't matter what the second ball is. Since no balls have been drawn before the first ball, probability = 3/10.

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