The second moment about mean is
A. $$\frac{{\sum {{\left( {{\text{X}} + {\text{x}}} \right)}^3}}}{{\text{N}}}$$
B. $$\frac{{\sum {{\left( {{\text{X}} - {\text{x}}} \right)}^2}}}{{\text{N}}}$$
C. $$\frac{{\sum {{\left( {{\text{X}} + {\text{x}}} \right)}^2}}}{{\text{X}}}$$
D. $$\frac{{\sum {{\left( {{\text{X}} - {\text{x}}} \right)}^3}}}{{\text{X}}}$$
Answer: Option B
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