Mean
number line?
The number that falls in the middle of a list of numbers is the median.
median
An ordered set of numbers is a set of numbers in which the order does matter. In ordinary sets {A, B} is the same as {B, A}. However, the ordered set (a, b) is not the same as the ordered set (B, a).
Surprisingly, it is called an ordered list of numbers!
Chronological order An ordered list of numbers is a "numerical sequence".
This is called sorting.
It is an ordered sequence.
The center value in a list of numbers is the Median average of the numbers. If there is an even number of items in the list, then the Median average is the Mean average of the two numbers in the center.
Mean
number line?
a scale
arithmetic
The number that falls in the middle of a list of numbers is the median.
Sequence
That's an infinite list.