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.
variable-a quantity that can assume any of a set of values. variable quantity. quantity-the concept that something has a magnitude and can be represented in mathematical expressions by a constant or a variable. argument-a variable in a logical or mathematical expression whose value determines the dependent variable; if f(x)=y, x is the independent variable.