A) 5
B) 10
C) 15
D) 20
Correct Answer: C
Solution :
\[\overline{x}=\frac{{{x}_{1}}+{{x}_{2}}+.......+{{x}_{n}}}{n}\] Now, \[\frac{({{x}_{1}}+5)+({{x}_{2}}+5)+......+({{x}_{n}}+5)}{n}=10\] \[\Rightarrow \overline{x}=5\] \[\frac{3{{x}_{1}}+3{{x}_{2}}+..........3{{x}_{n}}}{n}=\frac{3({{x}_{1}}+{{x}_{2}}.....+{{x}_{n}})}{n}\] \[=3\times 5=15\]
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