given x times px over py let's interpret this equation for a moment so what are we doing here we're interested in finding this mission over X given Y so we can associate a story with this imagine X is the state of the system and Y is a sensor reading we might obtain and so we want to know what's the distribution of our possible states of this system given we have a sensory reading Y well it's not easy to come up with a table for that it's not easy to just say oh you know what I'm just gonna build a table for a px given y because it's