kind of properties you would derive all right so there are discrete random variables and continuous random variables so here we have Omega again the rectangle and again think of every point in the rectangle as representing one possible state of the entire world and then X is our random variable we work with X can take on four values if the event in indicates the world is in a state that's in that leftmost rectangle we say x equals x1 if it's in that triangle above it's x equals x2 and so forth and so there's only four values X