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.
Bone marrow tests are used to check whether your bone marrow is healthy. These tests also show whether your bone marrow is making normal amounts of blood cells. Bone marrow is the sponge-like tissue inside the bones.It contains stem cells that develop into the three types of blood cells that the body needs:1  Red blood cells carry oxygen through the body. 2  White blood cells fight infection.hese tests also show whether your bone marrow is making normal amounts of blood cells. Bone marrow is the sponge-like tissue inside the bones. It contains stem cells that develop into the three types of blood cells that the body needs: 1  Red blood cells carry oxygen through the body. 2  White blood cells fight infection.