Question

Dataset :- $3,5,6,7,x,3,4$
Mean of the data set is given as 5. What is the value of $x$ ?

• A. 28
• B. 7
• C. 35
• D. 5

Answer 1

The correct option is B 7

Sum of the observations in the dataset $=3+5+6+7+x+3+4=x+28$

Mean = $\frac{\text{Sum of Observations}}{\text{Number of Observation}}$

$\Rightarrow 5=\frac{x+28}{7}$
$\Rightarrow 35-28=x$
$\Rightarrow x=7$