The simplest and most effiecent method to use to assign probablities, is to look at the Mean , Standard Deviation and a Normal Distribution Table which is where you will find Z score probs , do a search on the internet an download a z score table from -3 to +3, or ask you son or daughter if they are currently in High school they will be able to point you in the right direction, this is really very basic maths we are talking about.
The hard part starts once you gain a lil knowledge on this subject.

[ This Message was edited by: woof43 on 2003-01-01 00:01 ]