[<< wikibooks] Statistics/Distributions/Probability
This page under Heavy Construction!
Key componants of Probability Distributions: 
1) Are greater than 0 
2) the total =1 
3) It describes the likelihood X=x (if discrete) or X=[range] if continuous 

The set of ordered pairs (x,f(x)) is a probability distribution function if:
1) 
It
2) 
3)