# mean

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## mean,

in statistics, a type of averageaverage,
number used to represent or characterize a group of numbers. The most common type of average is the arithmetic mean. See median; mode.
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. The arithmetic mean of a group of numbers is found by dividing their sum by the number of members in the group; e.g., the sum of the seven numbers 4, 5, 6, 9, 13, 14, and 19 is 70 so their mean is 70 divided by 7, or 10. Less often used is the geometric mean (for two quantities, the square root of their product; for n quantities, the nth root of their product).

## mean

see MEASURES OF CENTRAL TENDENCY.

## mean

[mēn]
(mathematics)
A single number that typifies a set of numbers, such as the arithmetic mean, the geometric mean, or the expected value. Also known as mean value.

## mean

Maths
a. the second and third terms of a proportion, as b and c in a/b = c/d
b. another name for average See also geometric mean

## MEAN

(MongoDB, Express, AngularJS, Node.js) A set of system software used for developing JavaScript-based Web applications. Node.js is server-side JavaScript, while Express provides an abbreviated framework for it. AngularJS is used for client-side JavaScript, and MongoDB is a highly scalable database that supports full clustering and automatic sharding. See MongoDB, Node.js, LAMP and database partitioning.
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