Assume a single trial that can take only two outcomes (``Yes'' and ``No'' or 0 and 1 or ``Head'' and ``Tail'' etc.). Such a variable is called a **Binary** or **Bernoulli** random variable. Now, assume that such a single trial is repeated times. A **Binomial** (discrete) variable is the number of ``successes'' in these trials and its' probability distribution describes the Probability of each number
.

**Mean and Variance**

2007-05-04