• If you are citizen of an European Union member nation, you may not use this service unless you are at least 16 years old.

  • Finally, you can manage your Google Docs, uploads, and email attachments (plus Dropbox and Slack files) in one convenient place. Claim a free account, and in less than 2 minutes, Dokkio (from the makers of PBworks) can automatically organize your content for you.


Random Coin Flips Answer

Page history last edited by peterga 11 years, 2 months ago


Answer:  The professor simply assumes to be fake any series that does not include at least one run of 6 heads in a row or six tails in a row.


The trick is based on Bayes' theorem, which informs us that any truly random flip of a coin will generally (don't know exact %) include a run of six.  But that's not how our pattern-fixated minds think of randomness, so runs this long look non-random to people faking results.



See also:  Random Coin Flips 2


Source:  Leonard Mlodinow, "The Drunkard's Walk:  How Randomness Rules our Lives"


Back to Pete's Puzzle Page


Comments (0)

You don't have permission to comment on this page.