Question

The class - mark of class interval 10-15 is _____________

• A. 12.5
• B. 11.5
• C. 12
• D. 25

Answer 1

The correct option is A

12.5

The class mark of the interval is the value midway between the acutal lower limit and the actual upper limit.

In the given class interval , the lower limit = 10

And the upper limit = 15

Hence the class mark = $\frac{10+15}{2}$

= $\frac{25}{2}$

= 12.5