A baby is added to a hospital nursery. Before the baby was added there were two boys in the nursery and an uncounted number of girls. After the new baby is added a baby is selected at random among all the babies. The selected baby is a boy.

What is the probability that the added baby was a girl?

I'm probably all wet on this but it seems to me that teh baby chose at random AFTER a baby was added would have no influence on the probabilities associated with that baby so the probabality that the added baby was a girl is a little better than 50% because there are slightly more females than males born.

Posted by FatBoy on 2003-10-08 13:04:41