For a frequency distribution,the standard deviation is computed by:
- A$\sigma = \frac{\sum f(x - \bar{x})}{\sum f}$
- B$\sigma = \frac{\sqrt{\sum f(x - \bar{x})^2}}{\sum f}$
- C$\sigma = \sqrt{\frac{\sum f(x - \bar{x})^2}{\sum f}}$
- D$\sigma = \sqrt{\frac{\sum f(x - \bar{x})}{\sum f}}$
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