Question

it is a maths question of statistics sum pls solve it step by step

Answer 1

xbar = (Σ(i = 1 to n)xi)/n  

or, n*xbar = Σ(i = 1 to n)xi  

or, Σ(i = 1 to n)xi - n*xbar = 0  

or, Σ(i = 1 to n)xi - Σ(i = 1 to n)xbar = 0  

or, Σ(i = 1 to n)(xi - xbar) = 0