1. The problem asks for the definition of the median in a data set. 2. The median is a measure of central tendency that represents the middle value when the data is ordered. 3. The options given are: A. The value that lies in the middle of the data when the data set is ordered. B. The sum of the data entries divided by the number of entries (this is the mean). C. The data entry that occurs with the greatest frequency (this is the mode). D. The data entry that is far removed from the other entries (this describes an outlier). 4. Therefore, the correct definition of median is option A. Final answer: A