Question

Choose the correct answer in each of the following questions:
If $\overline{x}$ is the mean of $x_1,x_2,x_y,\dots x_n$ then ${\sum }_{i=1}^n(x_i-\overline{x})=?$
(a) -1
(b) 0
(c) 1
(d) n-1

Answer 1

ANSWER:
(b) 0
If x is the mean of x1, x2, x3, x4,...xn,
then we have∑ni=1(xi−¯x) =0