question_answer

The mean of n observations is\[\overrightarrow{X}.\]If each observation is multiplied by k. what is the mean of new observations?

A) \[k\,\bar{X}\]                          

B)  \[\,\bar{X}\]               

C) \[\,\bar{X}+k\]           

D)   \[\,\bar{X}-k\]