can take on the probability associated with X equal X 1 we can think of like essentially the mass associated with that region in the rectangle and we call P a probability mass function a simpler example than the abstract rectangle there would be a coin flip heads and tails probability half for each that's another example of a distribution again you can think of as in the context of that rectangle though you can say I have a rectangle I split it in half there is heads and tails and you know have the states of the entire world my coin came