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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 ?
The results of Havas' Meaningful Brands analysis revealed that a brand's "Share of Wallet" -- a metric used to measure the percentage spent with a brand vs.
0 supports Meaningful Use Stage 1 and Stage 2 measures and is eligible for federal incentives.
An inability to incorporate Stage 2 requirements into their workflow in time to meet meaningful use.
Nonetheless, most radiology practices have yet to embrace meaningful use, begging the question: Why not?
This stage will allow for the meaningful exchange of public health data with state data systems for syndromic surveillance, electronic laboratory reporting and immunization encounter reporting.
Davis wants to meet the Medicare requirements in 2011 so that NorthCrest will have until 2014 to meet the Stage 2 requirements for meaningful use.
There is a great deal of interest in the meaningful use program," said William Underwood, a senior associate in the division of medical practice, professionalism, and quality for the American College of Physicians.
And practices of all sizes are waiting for vendors to finish rolling out updates that show they're in compliance with meaningful use certification, he said.
On the one hand, this milestone is easy to spot: 2011 is the year it became possible for providers to be meaningful users of EHRs, and to earn a financial reward for this accomplishment.
For hospitals to meet Meaningful Use standards, the ED will play a critical role if you have an EDIS that addresses the requirements, said Robert Hitchcock, MD, T-System s vice president of solution management.
People are very different - what is meaningful to one person may not be meaningful to another, and what someone finds meaningful at the age of 23 may not be how they feel at 43.