A) \[20%\]
B) \[25%\]
C) \[30%\]
D) \[35%\]
Correct Answer: B
Solution :
[b] \[\because S.D.(\sigma )=\sqrt{\frac{\sum {{x}^{2}}}{n}-{{\left( \frac{\sum x}{n} \right)}^{2}}}=\sqrt{\frac{1530}{10}-{{(12)}^{2}}}\]Variance \[={{\left( S.D \right)}^{2}}={{\sigma }^{2}}=9.\] Coefficient of variance \[=\frac{\sigma }{\overline{x}}\times 100=\frac{3\times 100}{12}=25%\] Hence option [b] is correct.You need to login to perform this action.
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