Question

The class mark of the class $90–120$ is:

• A. $90$
• B. $105$
• C. $115$
• D. $120$

Answer 1

The correct option is B

$105$

Explanation for the correct option:

Find the class mark of the class $90–120$

Given that, the class is $90–120$

Here, the upper limit is $120$ and the lower limit is $90$.

$Classmark=\frac{Upperlimit+Lowerlimit}{2}$

$$\begin{gathered} =\frac{120+90}{2} \\ =\frac{210}{2} \\ =105 \end{gathered}$$

The class mark of the class $90–120$ is $105$.

Therefore, option (B) $105$ is the right answer.