Board Question Paper : July 2018 — Statistics STD 12 Commerce — Question
Gujarat BoardEnglish MediumSTD 12 CommerceStatisticsBoard Question Paper : July 20181 Mark
Question
For a normal distribution, the estimated value of quartile deviation is $12 .$ Find the value of its standard deviation.
✓
Answer
In normal distribution fourth quartile $=\frac{2}{3} \sigma,$
therefore $12=\frac{2}{3} \sigma$
$\therefore \sigma=\frac{12 x^3}{2} 18 \text {. }$
Thus, the value of sturdard deviation is $18 .$
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