The middle of a sorted list of numbers.

The MOST frequent number in a set of numbers.

A single number used to describe a set of numeric data.

The difference between the highest and lowest values.

Numbers separating an ordered distribution into four groups, each containing (as closely as possible) equal numbers of values.

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Measures of Center

Mean, median and mode with measures of center

Term	Definition
Mean	The average of a set numbers.
Median	The middle of a sorted list of numbers.
Mode	The MOST frequent number in a set of numbers.
Measure of center	A single number used to describe a set of numeric data.
Range	The difference between the highest and lowest values.
Quartiles	Numbers separating an ordered distribution into four groups, each containing (as closely as possible) equal numbers of values.