order pair
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a set
Any well-defined set of numbers.
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).
The rational numbers, the real numbers and sets of higher order which contain the reals such as the complex numbers.
To find the median of a set of numbers, you first need to arrange the numbers in either ascending or descending order. Once the numbers are arranged, the median is the middle number in the set. In this case, when the numbers are arranged in ascending order, the set becomes 43, 44, 45, 47, 48, 49, 49, 52, 53. Since there are 9 numbers in total, the middle number is the 5th number, which is 48. Therefore, the median of the given set of numbers is 48.