What is the class mark of the class interval 11.5 - 16.5?
Class mark of the class interval 11.5−16.5 = 11.5+16.52
= 282
= 14
The class mark of class interval 25-30 is ______
Class-mark of the class-interval 35 - 55 is
The class - mark of class interval 10-15 is _____________