1 Polyps: Benign growths in the uterine lining (endometrium) can cause a heavy or prolonged period. 2  Ovary dysfunction: Lack of ovulation (anovulation) results in a lack of progesterone, causing heavy periods. 3  Adenomyosis: When glands from the uterine lining embed in uterine muscle, heavy bleeding can occur.
Mean and Variance of Random Variables. The mean of a random variable provides the long-run average of the variable, or the expected average outcome over many observations.
A variable is any factor that can be changed or controlled. In math, a variable is a quantity that can assume any value from a set of values. A scientific variable is a little more complicated, plus there are different types of scientific variables. Scientific variables are associated with the scientific method.