question_answer

If \[M=\frac{{{x}_{1}}+{{x}_{2}}+.....+{{x}_{20}}}{20}\], then the value of\[\sum\limits_{i=1}^{20}{\frac{({{x}_{1}}-M)}{20}}\]is

A)  \[\frac{19M}{20}\]         

B)         1

C)  0                              

D)         \[\frac{1}{20}\]