1 The weight of a fire fighter would be an example of a continuous variable; since a fire fighter's weight could take on any value between 150 and 250 pounds.  Suppose we flip a coin and count the number of heads. The number of heads could be any integer value between 0 and plus infinity.
A postal code is a series of letters and/or digits appended to a postal address for the purpose of sorting mail. Once postal codes were introduced, other applications became possible. In February 2005, 117 of the 190 member countries of the Universal Postal Union had postal code systems.
List of postal codes in Pakistan. Postal Codes were introduced in Pakistan on 1 January 1988 to speed sortation and delivery. These codes are for the delivery post office in whose jurisdiction the address falls. For example, for the entire Defence Housing Authority (DHA) area (all 8 phases), Karachi, the delivery code is 75500. This code is not meant for the main DHA including post office's attached branch office.