# standard deviation

standard deviation

**MLA Style**

"standard deviation." YourDictionary, n.d. Web. 17 September 2018. <http://www.yourdictionary.com/standard-deviation>.

**APA Style**

standard deviation. (n.d.). Retrieved September 17th, 2018, from http://www.yourdictionary.com/standard-deviation

## standard deviation

noun

*Abbr.*

**SD**

**MLA Style**

"standard deviation." YourDictionary, n.d. Web. 17 September 2018. <http://www.yourdictionary.com/standard-deviation>.

**APA Style**

standard deviation. (n.d.). Retrieved September 17th, 2018, from http://www.yourdictionary.com/standard-deviation

(*plural* standard deviations)

Coined by English mathematician Karl Pearson in 1894 in his paper "On the dissection of asymmetrical frequency curves".

**MLA Style**

"standard deviation." YourDictionary, n.d. Web. 17 September 2018. <http://www.yourdictionary.com/standard-deviation>.

**APA Style**

standard deviation. (n.d.). Retrieved September 17th, 2018, from http://www.yourdictionary.com/standard-deviation

## standard deviation - Computer Definition

In statistics, the average amount a number varies from the average number in a series of numbers.

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## standard deviation - Investment & Finance Definition

The degree that a single value in a group of values varies from the mean (average) of the distribution. Standard deviation is a statistical measure that uses past performance of an investment or portfolio to determine the potential range of future performance and assess the probability of that performance. Standard deviations can be calculated for an individual security or for the entire portfolio.

Used by arrangement with John Wiley & Sons, Inc.

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