A) \[9\]
B) \[12\]
C) \[15\]
D) \[18\]
Correct Answer: C
Solution :
Since, root mean squares arithmetic mean \[\therefore \] \[\sqrt{\frac{\sum\limits_{i=1}^{n}{x_{i}^{2}}}{n}}\ge \frac{\sum\limits_{i=1}^{n}{{{x}_{i}}}}{n}=\sqrt{\frac{400}{n}}\ge \frac{80}{n}\] \[\Rightarrow \] \[n\ge 16\] Hence, possible value of \[n\] is\[18\].You need to login to perform this action.
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