 
you chose ... you are the rain drops are A common problem is that we believe random things are more uniform than they are. This is true on average for large numbers of things, but when we are dealing with relatively small numbers things are typically far more uneven. In this pattern there are exactly 5 rain drops on every tile. It is just possible that this happened by chance  but extremely unlikely. In fact, it was deliberately generated to have exactly the same number of rain drops in each square, although otherwise is completely random. This is an example where there is no nonuniformity or bias in the average distribution, but a correlation between the outcomes of different trials. effectively each raindrop avoided 'overcrowded' tiles!
back to: the story  day 1  day 2  day 3  statistics tutorial 

http://www.meandeviation.com/tutorials/stats/story/l 
Alan Dix 5/8/98 