Question

The mean of $15$ observations is $32$. Find the resulting mean, if each observation is multiplied $2$.

• A. 64
• B. 55
• C. 60
• D. None of these

Answer 1

The correct option is A 64

Mean of $15$ observations $=$ $32$
Sum of $15$ observations $=$ $15\times 32$ = $480$
Since, each observation is multiplied by $2$, new sum $=$ $15\times 32\times 2$ $=$ $960$
Thus, new mean $=$ $\frac{\text{sum}}{\text{number of observation}}$ $=$ $\frac{960}{15}$ $=$ $64$