# mean+standard

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**mean deviation**— In statistics, the arithmetic mean of the deviations (all taken as positive numbers) of all the numbers in a set of numbers from their arithmetic mean. For example, the arithmetic mean of 5, 8, 9, and 10 is 8, and therefore the deviations from… …62

**standard deviation**— noun Date: 1894 1. a measure of the dispersion of a frequency distribution that is the square root of the arithmetic mean of the squares of the deviation of each of the class frequencies from the arithmetic mean of the frequency distribution;… …63

**Standard of living**— The standard of living refers to the quality and quantity of goods and services available to people, and the way these goods and services are distributed within a population. It is generally measured by standards such as income inequality,… …64

**standard of living**— a grade or level of subsistence and comfort in everyday life enjoyed by a community, class, or individual: The well educated generally have a high standard of living. Also called living standard. [1900 05] * * * Level of material comfort that an… …65

**mean**— A statistical measurement of central tendency or average of a set of values, usually assumed to be the arithmetic m. unless otherwise specified. [M.E., mene fr. O.Fr., fr. L. medianus, in the middle] arithmetic m. the m. calculated by adding a… …66

**Mean time between outages**— In a system the mean time between outages (MTBO) is the mean time between equipment failures that result in loss of system continuity or unacceptable degradation. The MTBO is calculated by the equation, where MTBF is the nonredundant mean time… …67

**Standard de temps**— L horloge astronomique de Strasbourg. Un Standard de temps est la spécification soit du rythme du temps qui passe soit de temps fixes, soit des deux. Par exemple le standard du temps civil spécifie les deux à la fois: les intervalles temporels et …68

**standard deviation**— Statistics. a measure of dispersion in a frequency distribution, equal to the square root of the mean of the squares of the deviations from the arithmetic mean of the distribution. [1920 25] * * * ▪ statistics in statistics, a measure of… …69

**Standard Deviation**— 1. A measure of the dispersion of a set of data from its mean. The more spread apart the data, the higher the deviation. Standard deviation is calculated as the square root of variance. 2. In finance, standard deviation is applied to the annual… …70

**standard atmosphere**— 1. an arbitrarily determined vertical distribution of atmospheric pressure, temperature, and density, assumed to have physical constants and conforming to parametric equations, used for calculations in ballistics, the design of pressure… …