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The expected value of a random variable. Arithmetic average of a sample.

Arithmetic Mean Average

An average calculated by adding the value of the points in a data set and dividing the sum by the number of data points. For example, suppose one wishes to calculate the average income of a country with exactly five people in it, and their incomes are $25,000, $26,000, $43,000, $70,000, and $72,000. It is calculated as:

($25,000 + $26,000 + $43,000 + $70,000 + $72,000) / 5 = $47,200.

A limitation to the arithmetic mean average is that it can be overly affected by extremes in either direction. For example, if one of the five persons in the country earns $100 billion per year, the arithmetic mean average income would be in the billions and would not accurately count the other four citizens. For this reason, many analysts use the median in conjunction with the arithmetic mean average. The arithmetic mean average is also called simply the mean.


The average of a set of numbers.Contrast with median,which is the middle figure in a set of numbers,and mode,which is the value that appears most often in a set of numbers.

Example: A survey of home values in a neighborhood of nine houses obtained the following values:

The mean, or average, is the total of all values divided by 9, or $143,044.The median is the middle number when the numbers are all arranged from highest to lowest,which would be house 5, or $139,850.The mode is $139,000,because it is the number that appears most often.

References in periodicals archive ?
PCI Express is a registered trademark of the PCI-SIG.
Amtrak Express Parcels - ANC - Business Post Group - DHL International (UK) - Geopost - Initial City Link - Interlink Express Parcels - Lynx Express - Nightfreight - Target Express Parcels - TNT Express Worldwide (UK) - Tuffnells Parcels Express - UPS
American Express has for many years been a proud supporter of Boys & Girls Club of America and we share in the celebration of this tremendous milestone," said Lisa Gregg, vice president, Marketing, American Express Establishment Services.
The PCI Express board can be used as a plug-in card or to plug a PCI Express add-in card in it, providing the user with a flexible PCI Express Kit that can be tailored to meet their specific needs.
Additionally, American Express Cardmembers who are enrolled in the Membership Rewards(R) program or have a rewards card such as the Hilton HHonors(R) Platinum Credit Card, Blue Cash(R), or the TrueEarnings(SM) Card from Costco and American Express can use their Card to earn rewards for federal and state taxes in participating states(3) this tax season.
In addition to offerings, IBM Express Advantage will also focus on delivering a superior customer experience and incorporate an entire set of resources, enablement, tools and incentives specially designed for Business Partners who service mid-size clients.
American Express understands the unique challenges of bringing this program to market because of our long-standing relationship with the Transportation Security Administration (TSA), involvement in the Registered Traveler Interoperability Consortium (RTIC) and with other key players," commented Marcella Shinder, Vice President and Head of Global Marketing, American Express Business Travel.
The new, ground-breaking American Express e-auction technology supports an historically complex event management bidding process, making it easier than ever for corporations to realize greater value from their meetings investment, better leverage preferred supplier relationships, and more closely link meetings purchasing to their overall travel procurement strategy," said Jay Roseman, Vice President of Corporate Meeting Solutions, American Express Business Travel.
The availability of the PCI Express development kit is a major step in lowering the barrier to PCI Express system design," said Simon Lau, president of Eureka Technology.
PCI Express has become a standard feature in the desktop and server computers shipping today," said Stan Kopec, Lattice vice president of corporate marketing.
DHL Import Express Online combines DHL's global reach and understanding of importing with a web interface that emphasizes superior customer service and ease of use.