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# About: Discrete Random Variables: Summary of the Discrete Probability Functions

Module by: Susan Dean, Barbara Illowsky, Ph.D.. E-mail the authors

 Name: Discrete Random Variables: Summary of the Discrete Probability Functions ID: m16833 Language: English (en) Summary: This module provides a review of the binomial, geometric, hypergeometric, and Poisson probability distribution functions and their properties. Subject: Mathematics and Statistics Keywords: binomial, discrete, elementary, formula, function, geometric, hypergeometrical, Poisson, probability, random, statistics, variable License: Creative Commons Attribution License CC-BY 3.0 Authors: Copyright Holders: Maintainers: Latest version: 1.11 (history) First publication date: May 29, 2008 1:37 pm -0500 Last revision to module: Aug 8, 2013 12:05 pm -0500

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## Version History

 Version: 1.11 Aug 8, 2013 12:05 pm -0500 by Changes: `Module: Discrete Random Variables: Summary of the Discrete Probability Functions: Minor edit` Version: 1.10 May 22, 2012 3:41 pm -0500 by Changes: `Discrete Random Variables: Summary of the Discrete Probability Functions: Added formula for variance to the Poisson` Version: 1.9 Apr 28, 2012 11:07 am -0500 by Changes: `Discrete Random Variables: Summary of the Discrete Probability Functions: Corrected the formula for the Poisson standard deviation.` Version: 1.8 Feb 7, 2009 4:02 pm -0600 by Changes: `Discrete Random Variables: Summary of the Discrete Probability Functions: Changed the variance formulas to standard deviation formulas. Added language to the Poisson about "large" n and "small" p.` Version: 1.7 Jan 21, 2009 5:03 pm -0600 by Changes: `Discrete Random Variables: Summary of the Discrete Probability Functions: Added language for clarity. ` Version: 1.6 Oct 27, 2008 2:38 pm -0500 by Changes: `roles updated` Version: 1.5 Jul 31, 2008 10:13 am -0500 by Changes: `removed draft note` Version: 1.4 Jul 7, 2008 12:28 pm -0500 by Changes: `post review updates` Version: 1.3 Jun 30, 2008 11:29 pm -0500 by Changes: `Updated for consistency within collection` Version: 1.2 Jun 27, 2008 10:50 am -0500 by Changes: `Roles changed` Version: 1.1 Jun 23, 2008 1:18 am -0500 by Changes: `Initial publication`

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## How to Cite and Attribute This Content

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### American Chemical Society (ACS) Style Guide:

Dean, S.; Illowsky, B. Discrete Random Variables: Summary of the Discrete Probability Functions, OpenStax-CNX Web site. http://cnx.org/content/m16833/1.11/, Aug 8, 2013.

### American Medical Assocation (AMA) Manual of Style:

Dean S, Illowsky B. Discrete Random Variables: Summary of the Discrete Probability Functions [OpenStax-CNX Web site]. August 8, 2013. Available at: http://cnx.org/content/m16833/1.11/.

### American Psychological Assocation (APA) Publication Manual:

Dean, S., & Illowsky, B. (2013, August 8). Discrete Random Variables: Summary of the Discrete Probability Functions. Retrieved from the OpenStax-CNX Web site: http://cnx.org/content/m16833/1.11/

### Chicago Manual of Style (Bibliography):

Dean, Susan, and Barbara Illowsky. "Discrete Random Variables: Summary of the Discrete Probability Functions." OpenStax-CNX. August 8, 2013. http://cnx.org/content/m16833/1.11/.

### Chicago Manual of Style (Note):

Susan Dean and Barbara Illowsky, "Discrete Random Variables: Summary of the Discrete Probability Functions," OpenStax-CNX, August 8, 2013, http://cnx.org/content/m16833/1.11/.

### Chicago Manual of Style (Reference, in Author-Date style):

Dean, S., & Illowsky, B. 2013. Discrete Random Variables: Summary of the Discrete Probability Functions. OpenStax-CNX, August 8, 2013. http://cnx.org/content/m16833/1.11/.

### Modern Languages Association (MLA) Style Manual:

Dean, Susan, and Barbara Illowsky. Discrete Random Variables: Summary of the Discrete Probability Functions. OpenStax-CNX. 8 Aug. 2013 <http://cnx.org/content/m16833/1.11/>.