An analogous formula applies to the case of a continuous probability distribution. Not every probability distribution has a defined mean; see the Cauchy distribution for an example. Moreover, for some distributions the mean is infinite: for example, when the probability of the value is for n = 1, 2, 3, ....
Red blood cell (RBC) production (erythropoiesis) takes place in the bone marrow under the control of the hormone erythropoietin (EPO). Juxtaglomerular cells in the kidney produce EPO in response to decreased O 2 delivery (as in anemia and hypoxia) and increased levels of androgens.
Red bone marrow is the active portion that produces red blood cells, while yellow bone marrow contains fat cells. In adults the red bone marrow is located in the flat bones, such as the upper hip bones, known as the pelvic girdle, and the sternum.n the center of most large bones there is a soft tissue (called bone marrow) that makes most of the body's blood cells. The marrow is a network of tissue that contains immature blood cells in an organized structure.