Mathematics: If the average value of a set of data is X, then each number of this set of data is added with 2. What is the average value of the new set of data?
Let (x 1+x2+。 +xn)/n = 2。
Then (x 1+2+x2+2+...+xn+2)/n
=(x 1+x2+...+xn+2n)/n
=(x 1+x2+...+xn)/n +2
=x+2
That is, the average value of a new set of data is x+2.