Statistics And Probability Question 247
Question: For a frequency distribution standard deviation is computed by applying the formula
[Kurukshetra CEE 1999]
Options:
A) $ \sigma =\sqrt{( \frac{\sum ,fd}{\sum ,f} )-\frac{\sum ,fd^{2}}{\sum ,f}} $
B) $ \sigma =\sqrt{\frac{\sum ,fd^{2}}{\sum ,f}-{{( \frac{\sum ,fd^{2}}{\sum ,f} )}^{2}}} $
C) $ \sigma =\sqrt{{{( \frac{\sum ,fd}{\sum ,f} )}^{2}}-\frac{\sum ,fd^{2}}{\sum ,f}} $
D) $ \sigma =\sqrt{\frac{\sum ,fd^{2}}{\sum ,f}-{{( \frac{\sum ,fd}{\sum ,f} )}^{2}}} $
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Answer:
Correct Answer: D
Solution:
It is obvious.
BETA
