Average is the number that is found by dividing the sum of data by the number of items in the data set.verage is the number that is found by dividing the sum of data by the number of items in the data set.
Blood is always red, actually. Veins look blue because light has to penetrate the skin to illuminate them, blue and red light (being of different wavelengths) penetrate with different degrees of success. What makes it back to your eye is the blue light. Meanwhile, here's what happens to the blood in your body:
Without oxygen, your body couldn't keep working and stay alive. White Blood Cells. White blood cells (also called leukocytes, say: LOO-kuh-sytes) are bigger than red blood cells. There are usually not a whole lot of white blood cells floating around in your blood when you're healthy. Once you get sick, though, your body makes some more to protect you. There are a couple types of white blood cells that do different things to keep you well: Granulocytes. You know how your skin gets a little red and swollen around a cut or scrape?