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.
Types of variables flowchart: 1  A continuous variabl e is a numeric variable. 2  A discrete variable is a numeric variable. 3  An ordinal varia ble is a categorical variable. 4  A nominal variable is a categorical variable. Examples of continuous variables include height, time, age, and temperature. 2  A discrete variable is a numeric variable. 3  Observations can take a value based on a count from a set of distinct whole values.