Standard deviation can be expressed as
A. $$\frac{{\sum \left| {\overline x - x} \right|}}{N}$$
B. $$\frac{{\sum \left| {x - \overline x } \right|}}{N}$$
C. $$\sigma = \sqrt {\frac{{\sum {{\left( {x - \overline x } \right)}^2}}}{N}} $$
D. None of the above
Answer: Option C

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