In normal distribution Q1=_________?
Correct answer: D. u - .6745 (S.D.)
- A. u + .6745 (S.D.)
- B. u - .7979 (S.D.)
- C. u + .6745 (S.D.)
- D. u - .6745 (S.D.)
Explanation
The first quartile is the 25th percentile, whose standard-normal z value is about −0.6745. Converting back gives Q1 = μ − 0.6745σ, whereas the positive value gives Q3.
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