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:
The color of the menstrual blood depends on bleeding rate. Slow bleeding results in darker menstrual blood. During the first 2 days of the onset of the periods, one may see deep red color blood coming out. Whereas, the color changes to dark brown or even black near the end of the periods. This is absolutely a normal color change that happens when the blood is older and not being expelled from the body quickly.