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For a frequency distribution standard deviation is computed by applying the formula
(A) \( \sigma=\sqrt{\frac{\sum f d^{2}}{\sum f}-\left(\frac{\sum f d}{\sum f}\right)^{2}} \)
(B) \( \sigma=\sqrt{\left(\frac{\sum f d}{\Sigma f}\right)^{2}-\frac{\Sigma f d^{2}}{\Sigma f}} \)
(C) \( \sigma=\sqrt{\frac{\sum f d^{2}}{\Sigma f}-\frac{\sum f d}{\sum f}} \)
(D) \( \sqrt{\left(\frac{\Sigma f d}{\Sigma f}\right)^{2}-\frac{\Sigma f d^{2}}{\Sigma f}} \)
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