In probability theory and statistics, a median is described as the number separating the higher half of a sample from the lower half.
So if you have 19 measurements and order them from least to greatest, the tenth value is the median.
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Median
the midpoint of the data set
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 the median
S={1,2,4,5,7}, the median is 4