question_answer

If \[{{\mathbf{x}}_{\mathbf{1}}},\text{ }{{\mathbf{x}}_{\mathbf{2}}},\text{ }\ldots \ldots \ldots ,\text{ }{{\mathbf{x}}_{\mathbf{n}}}\]are n values of variables X such that \[\sum\limits_{\mathbf{i=1}}^{\mathbf{k}}{\mathbf{(}{{\mathbf{x}}_{\mathbf{i}}}\mathbf{-3)}}\mathbf{=135}\] and \[\sum\limits_{\mathbf{i=1}}^{\mathbf{k}}{\mathbf{(}{{\mathbf{x}}_{\mathbf{i}}}\mathbf{-6)}}\mathbf{=60}\]Then the value of mean is ________

A) 7.4                                                      

B) 9.2

C) 8.4    

D) 8.6

E) None of these