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11.1: Mean

Difficulty Level: At Grade Created by: CK-12
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The arithmetic mean is often called the average.


Data is information that has been collected to represent real life situations, usually in number form.

Geometric mean

The geometric mean is a method of finding the ‘middle’ value in a set that contains some values that are intrinsically more influential than others.

Harmonic mean

A harmonic mean is calculated by dividing the number of values in the set by the sum of the inverses of the values in the set.


The mean, often called the average, of a numerical set of data is simply the sum of the data values divided by the number of values.

measures of central tendency

The mean, median, and mode are known as the measures of central tendency.

Population Mean

The population mean is the mean of all of the members of an entire population.

Sample Mean

A sample mean is the mean only of the members of a sample or subset of a population.


A weighted value or set of values takes into account varying levels of importance among members of the set.

weighted average

A weighted average is an average that multiplies each component by a factor representing its frequency or probability.

weighted harmonic mean

A weighted harmonic mean is a harmonic mean of values with varying frequencies or weights.

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Date Created:
Dec 21, 2012
Last Modified:
Sep 08, 2016
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