Which of the Following Is the Formula for the Estimated $\frac { \sum ( X - \bar { X } ) } { N }$

Multiple Choice

Which of the following is the formula for the estimated population variance?

A) $\frac { \sum ( X - \bar { X } ) } { N }$

B) $\frac { \sum ( X - \bar { X } ) ^ { 2 } } { N }$

C) $\frac { \sum ( X - \bar { X } ) } { N - 1 }$

D) $\frac { \sum ( X - \bar { X } ) ^ { 2 } } { N - 1 }$