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It could be the standard deviation.
The x-values in a set of points
It can be data over any single interval in the set of real numbers.
No, a data set cannot have more than one median. The median is defined as the middle value of a sorted data set, or the average of the two middle values if the data set has an even number of observations. While a data set can have repeated values, the median itself remains a single value that represents the central tendency of the data.
It is halfway along the distribution of set values. There are as many members of the set with values smaller than the median as there are with values bigger than it.