Question

The sum of 15 observations of a data is $(434+x)$. If the mean of the data is $x$, then find $x$.

• A. 25
• B. 27
• C. 31
• D. 33

Answer 1

Answer: (C)

Given sum of all observations $=434+x$ and $n=15,\bar{x}=x$.
$\therefore \frac{434+x}{15}=x$
$434+x=15x$
$x=\frac{434}{14}\Rightarrow x=31$.