Probability of an Event

The long-run proportion of times that the event will occur if the underlying random process is repeated many, many times.

Random Variable

A number whose value depends on the outcome of a chance process.

Expected Value of a Random Variable

The long-run average of the values of a random variable, where the underlying chance process is repeated many, many times.

Continuous Random Variable

A random variable that can assume any value in a range of real numbers.

Distribution of a Random Variable

A statement of the probabilities for a random variable to assume its various possible values.

Encapsulation and Generalization

A method for developing a computer program according to which the programmer first designs a basic procedure, then encapsulates it in one or more functions, and then progressively generalizes these functions until the program possesses all desired features.