A) 30
B) 30.1
C) 29
D) 31
Correct Answer: D
Solution :
\[\sum\limits_{i=1}^{20}{({{x}_{i}}-30)=20}\] Þ \[\sum\limits_{i=1}^{20}{{{x}_{i}}-20\times 30=20}\] Þ \[\sum\limits_{i=1}^{20}{{{x}_{i}}=620}\]. Mean = \[\frac{\sum\limits_{i=1}^{20}{{{x}_{i}}}}{20}=\frac{620}{20}=31\].
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