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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 ?
At the July 26 event, the Blue World Order will reform and be in action, as Blue Meanie and Nova will face the "All Good" Anthony Greene and a mystery partner.
Of all the Green Meanies, Cassidy has the least interest in offing the Chanels because, as viewers know, he's in love with Chanel #3 (Billie Lourd).
Haughty Ted, showing good early speed, hit the front off the second bend, but Rio Rondo was always giving chase and Danny Riordan's brindle took it up at the penultimate bend and held Blue Meanie, who came again in good style, in 35.
html) synopsis for the episode, entitled "Halloween Blues," the trio decides to throw a Halloween party in the hospital to lure the Green Meanie and eventually catch him/her once and for all.
APCOA parking, which runs Edinburgh's Blue Meanie patrols, called police and Thom was charged with stealing from the meter.
But the controversial Minister for Sport was on the winning side for once this week as a meanie North-east rail company were forced to backtrack over plans to cash in on Wembley-bound Newcastle United fans.
For the last two Premiership games the man earmarked as Everton's Blue Meanie has managed to get his name on the score sheet before anybody else.
30pm: 5-4 Smooth Point 15-8 Special Event 11-4 Jamie Frankie 14 Trudys Gold 20 Blue Meanie 33 Mounteagle Mags.
The firm that runs Edinburgh's Blue Meanie patrols, APCOA Parking, called police and Thom was charged with stealing from the meter.
I agreed with Simon when he said it was the wrong song for me, although I still think he's a big meanie for voting against me.