The "middle" of a sorted list of numbers.
To find the Median, place the numbers in value order and find the middle number.
Example: find the Median of {13, 23, 11, 16, 15, 10, 26}
Put them in order: {10, 11, 13, 15, 16, 23, 26}
The middle number is 15, so the median is 15
When there are two middle numbers we average those two.
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