Question

The mean of $10$ numbers is $7$ If each number is multiplied by $12$ then the mean of new set of numbers is

• A. $82$
• B. $48$
• C. $78$
• D. $84$

Answer 1

Answer: (D)

$84$

Total of $10$ numbers $=10\times 7=70$
If each number is multiplied by $12$
New Total $=70\times 12$
$\therefore$ New mean = $\frac{70\times 12}{10}=84$