Question

The class mark of class $90-130$ is?

Answer 1

Class mark:

The classmark is the mean of the lower limit and the upper limit of the class interval.

$\mathbf{\text{Class mark=}}\frac{\mathbf{lower}\mathbf{}\mathbf{limit}\mathbf{+}\mathbf{upper}\mathbf{}\mathbf{limit}}{\mathbf{2}}$

$\Rightarrow$Class mark $=\frac{90+130}{2}$

$\Rightarrow$Class mark$=\frac{220}{2}$

$\Rightarrow$Class mark$=110$

Hence,class mark is $110$