In normal distribution Q.D. ( quartile deviation)is equal to________?
Correct answer: C. 0.6745 σ
- A. σ
- B. 0.7979 σ
- C. 0.6745 σ
- D. None of these
Explanation
For a normal distribution, Q1 and Q3 occur at z=−0.6745 and z=+0.6745, so half their difference is Q.D.=0.6745σ. Thus the quartile deviation is smaller than the standard deviation.
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