A) 82
B) 48
C) 78
D) 84
Correct Answer: D
Solution :
Total of 10 numbers\[=\text{1}0\times \text{7}=\text{7}0\] If each number is multiplied by 12, New total\[~=\text{7}0\times \text{12}\] \[\therefore \]New mean\[=\frac{70\times 12}{10}=84\]
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