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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 ?
Person B injected the drugs and observed the response heart rate (HR) and mean arterial pressure (MAP)) and person C who was an experienced qualified anaesthesiologist, intubated the patient.
Figure 3 shows the relationship between mean arterial pressure levels and estimated level of physical activity in individuals without HTN (P>0.
It tracks blood sugar, blood pressure (including systolic and diastolic), resting heart rate, mean arterial pressure and body mass index.
Mean arterial pressure rose in the control group and persisted for 5 min but both Group B and C attenuated the rise in MAP, more efficiently by Esmolol Group.
Less frequent brushing was associated with elevated total cholesterol and less frequent flossing was associated with elevated mean arterial pressure.
Changes in blood pressure were assessed as the difference of the value of mean arterial pressure after substance application minus the value of the last minute of the pre-substance stage.
The group taking a 400 mg tablet demonstrated significantly decreased standing systolic BP and mean arterial pressure, evincing saffron's valuable hypotensive action.
7 mm Hg in mean arterial pressure were also statistically significant.
Guanci and I have both checked the literature and consulted colleagues at our respective institutions and collectively we can see no advantage to monitoring mean arterial pressure (MAP) instead of systolic blood pressure (SBP) and diastolic blood pressure (DBP) parameters for acute ischemic stroke patients in a Stroke Unit (SU) that is not a critical care unit.
Phenylephrine infusion at the rate of 300 [micro]g/min and crystalloids were required to increase the mean arterial pressure and maintain cerebral perfusion pressure at greater than 70 mm Hg.