A) \[\sqrt{\frac{18}{34}}\]
B) 5
C) \[\sqrt{5}\]
D) \[\frac{3}{2}\]
Correct Answer: D
Solution :
Standard deviation \[\,=\sqrt{\frac{\sum\limits_{i=1}^{18}{{{({{x}_{i}}-8)}^{2}}}}{18}\,-\left( \frac{\sum\limits_{j=1}^{18}{({{x}_{j}}-8)}}{18} \right)}\] \[=\sqrt{\frac{45}{18}\,-{{\left( \frac{9}{18} \right)}^{2}}}\,\,=\sqrt{\frac{45}{18}\ -\frac{1}{4}}\,=\sqrt{\frac{81}{36}}\,=\frac{9}{6}\,=\frac{3}{2}\]
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