A) 30
B) 51
C) 31
D) 50
Correct Answer: C
Solution :
Here, \[\sum\limits_{i\,\,=\,\,1}^{50}{({{x}_{i}}-30)=50}\] \[\Rightarrow \sum\limits_{i=1}^{50}{{{x}_{i}}=50+50\times 30}\] \[\therefore \]Mean\[=\frac{\sum\limits_{i=1}^{50}{{{x}_{i}}}}{50}=\frac{50\times 31}{50}=31\]
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