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 blood cells, white blood cells and plasma are all formed inside of bones in the red bone marrow. Stem cells within the bone marrow constantly produce blood cells and work harder when the body is ill or bleeding to make up for blood cells lost.lowly, as the body ages, this marrow is replaced by inactive marrow that is known as yellow bone marrow. Red bone marrow is responsible for producing and destroying blood cells. About a third of the marrow's production consists of red blood cells and the rest is white blood cells and platelets.