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probability

Posted By: Daniel Murphy
Date: Wednesday, 30 July 2008, at 8:15 a.m.

In Response To: probability (Christian Munk-Christensen)

If the probability that a child is a girl is 1/2, and a couple has two children, and at least one of them is a girl, then the probability that both children are girls is 1/3.

Similarly, if the probability that a die rolled will show 4, 5 or 6 is 1/2, and two dice are rolled, and at least one of the two dice shows a 4, 5 or 6, then the probability that both dice show a 4, 5 or 6 is 9/27, or 1/3.

"My advice to the unborn is, don't be born with a gambling instinct unless you have a good sense of probabilities." -- Jack Dreyfus

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