Question

The Arithmetic mean of $10$ number is $-7$. If $5$ is added to every number, then the new Arithmetic mean is

• A. $-2$
• B. $12$
• C. $-7$
• D. $17$

Answer 1

The correct option is A $-2$

mean = $\frac{sum}{total}=-7$

$\frac{sum}{10}=-7$

$sum=-70$

$5$ is added to every $10$ no

New mean $=\frac{-70+50}{10}=-2$

$\{\text{since Total added}=50\}$