Question

The class mark of the class 70-80 in case of exclusive class interval is ______.

• A. 85
• B. 75
• C. 80
• D. 70

Answer 1

The correct option is B 75

Class mark is the average of upper boundary and lower boundary of a class in the case of exclusive class interval.

$\text{Class mark}=\frac{Upperboundary+Lowerboundary}{2}$

= $\frac{70+80}{2}$

= $\frac{150}{2}$

= 75