Question

The mean of a certain number of observations is $35$. What is the new value of the mean if each observation is multiplied by $2$.

• A. $70$
• B. $60$
• C. $50$
• D. None of these

Answer 1

Answer: (A)

$70$

Let there be $n$ observations

Mean of $n$ observations $=35n$.
After multiplying each observation by $2$, the new sum $=70n$
Therefore, new mean $=$ $\frac{70n}{n}=70$