If X is the mean of n values x1, x2, ......,xn of variable X, then ∑i=1n(xi-X) is always equal to _____________.

If X is the mean of n values x1, x2, ......,xn of variable X, then ∑

1.	If X is the mean of n values x1, x2, ......,xn of variable X, then ∑i=1n(xi-X) is always equal to _____________.
Answer» If $X$ is the mean of n values x₁, x₂, ......,x_n of variable X, then $\sum_{i = 1}^{n} (x_{i} - X)$ is always equal to _____________.