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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 ?
Thus, this is the first study showing that oral or intravenous administration of artemetin reduces, in a dose-dependent manner, the mean arterial pressure of rats, suggesting that this flavonoid is the main responsible for the cardiovascular effects popularly attributed to A.
For HD patients, correlation was low between QTc dispersion and hemoglobin level, electrolyte levels, mean arterial pressure, and duration of HD treatment (Table 4).
Blood pressure (Korotkoff phases I and V) and cardiac output (electrical impedance cardiography) were measured non-invasively, while mean arterial pressure and total peripheral resistance (TPR) were calculated according to standard procedures (Be lz et al.
The blood pressure increase was achieved using intravenous phenylephrine as needed to raise mean arterial pressure by 10% increments up to 140 mm Hg.
lt; < < < < On IABP After Switching to Impella Systolic Blood Pressure < < < < < 80 O 15 115 O 32 Diastolic Blood Pressure < < < < < 45 O 14 67 O 16 Mean Arterial Pressure < < < < < 57 O 13 83 O 17
with a mean arterial pressure <60 mmHg or a reduction in systolic blood pressure >40 mmHg from baseline) despite adequate volume resuscitation in the absence of other causes for hypotension (1).
This five-week training protocol produced a 5 mmHg reduction in diastolic pressure and a 4 mmHg reduction in mean arterial pressure, but no changes in systolic pressure.
CCC drops decreased the orthostatic fall in blood pressure versus placebo, as almost uniformly established at all times by mean arterial pressure and diastolic blood pressure.