If $X _ { 1 } , X _ { 2 } , X _ { 3 } , \ldots , X _ { N }$

Multiple Choice

If $X _ { 1 } , X _ { 2 } , X _ { 3 } , \ldots , X _ { N }$ are the $N$ observations of a variable from a population, then the population mean is symbolized by

A) $\mu$
B) $X$
C) $\Sigma$
D) $X$ .