Question

Find the mean of $x+3,x+5,x+7,x+9$ and $x+11$.

• A. $x+5$
• B. $x+7$
• C. $x+9$
• D. None of these

Answer 1

The correct option is B $x+7$

Mean of $x+3,x+5,x+7,x+9,x+11$.

We know, Mean is given by,

$\text{Mean}=\frac{\text{Sum of the elements}}{\text{Total number of elements}}$.

Here, number of observations $=5$.

$⟹$ Mean $=\frac{(x+3)+(x+5)+(x+7)+(x+9)+(x+11)}{5}$

$=\frac{5x+35}{5}=x+7$.

Therefore, option $B$ is correct.