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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 classic literature ?
Or is the same control to be extended to other artists, and are they also to be prohibited from exhibiting the opposite forms of vice and intemperance and meanness and indecency in sculpture and building and the other creative arts; and is he who cannot conform to this rule of ours to be prevented from practising his art in our State, lest the taste of our citizens be corrupted by him?
Who that sees the meanness of our politics but inly congratulates Washington that he is long already wrapped in his shroud, and for ever safe; that he was laid sweet in his grave, the hope of humanity not yet subjugated in him?
For a team known for it's meanness in coughing up tries, the concession of three tries in each of their last two games will not go down well.
So from where we sit, the 10-day deadline seems less like sheer meanness than managerial overconfidence.
They have shown such meanness over the funding of the elderly in care homes and have even used supermarket style bully-boy tactics to force care providers into accepting their lower-fee levels.
I am aware that there is an issue with meanness and the Scots.
It is another example of the meanness and the nastiness that are becoming more and more evident in our society.
ISESCO stated that this terrorist act perpetrated during the first day of Eid al-Fitr is a clear proof of the meanness of its perpetrators and their violation of Islamic teachings which forbid the spread of corruption on earth and the killing and intimidation of innocent people.
Don't they know their friends are few Because their meanness grew and grew, So loosen up that fist so tight And let contentment be in sight.
Does their meanness and spite stem from their envy of knowing that in the supporter's eyes they can never measure up to those they are slighting?
Sadly the debt mountain engendered by the greed-driven 'casino' economy has resulted in a meanness of spirit towards the unemployed and disabled because of a selfishness which has become all pervading.
The father's only explanation is people's meanness as a neighbor caused the closure of Dimitar's blacksmith shop in complaining about the noise.