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In mathematics, an average, mean, or central tendency of a data set refers to a measure of the "middle" or "expected" value of the data set.
Average or i wud like to call it presently' central tendency' always refers to a set of data ...i.e average finds the central tendency of the set So average of set will keep on changing if 'new ' elements are added.
When u take 10,20 its average is 15,then you added 30 to the set..it becomes 20..The central tendency of the set in this case increases...as new element is introduced. In short,Average always refers to a set ...if you reduce/increase the number of elements definitely the value will change.