If the average of a set of data x1, X2, X3,... Xn is 5, then the average of data 3x1 + 5, 3x2 + 5, 3x3 + 5,... 3XN + 5 is 5

If the average of a set of data x1, X2, X3,... Xn is 5, then the average of data 3x1 + 5, 3x2 + 5, 3x3 + 5,... 3XN + 5 is 5

[3(X1+X2+X3.Xn)+5N]/N=3*5+5=20