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) \[\sigma =\sqrt{\frac{\sum f(x-\bar{x})}{\sum f}}\]
Correct Answer: C
Solution :
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