Let x and y have joint probability density function. Cantidad vendida precio it im 82520092522525 10 25 250 25 p p it s d it img 25 225 9 q q 9 q. When x or y is discrete, the corresponding integral becomes a sum. Suppose x and y are independent probability distributions with probability density functions f x x and f y y, and cumulative probability function f x x and f y y. Mar 04, 2009 extremely you ought to combine out the y dependence. Then the marginal pdf s or pmfs probability mass functions, if you prefer this terminology for discrete random. Relacion entre costo e ingreso marginal linkedin slideshare. Two continuous random variables stat 414 415 stat online.