Clue for Riddle #4: Mythical City Population of Boys
The first thing to realise is that if you toss a coin 9 times and get 9 heads the tenth toss is still equally likely to be heads or tails.
For the second point, without giving too much away. Don't look from the families' perspective, but imagine the village has only one midwife. This midwife would see all the births in the village. In a given period what would she expect the mix of boys to girls to be?
A bit counter intuitive this one.
© Nigel Coldwell 2004 - – The questions on this site may be reproduced without further permission, I do not claim copyright over them. The answers are mine and may not be reproduced without my expressed prior consent. Please inquire using the link at the top of the page. Secure version of this page.