If there is an even number of elements in the set, the median is the average of the middle two, when listed in order, least to greatest.
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The median of a data set comprising only one value is that value. So the median of 2.5 is 2.5.
If you need to find a median between two numbers, pick one of them arbitrarily.
put them in order and the middle one is the median
If you have an even set of data then there are two middle numbers or medians. Average those two and create a median. Example: 2,3,4,7,9,10 4 and 7 are in the middle. (4+7)/2=5.5 5.5 is the median even though it is not one of the numbers in the data set.
Only if all values in the dataset are equal. Otherwise, it is impossible. If there are two numbers in the dataset, the median is the average of these two numbers. If there are three numbers, then the second number is the median or one number away from the maximum.