Question

The class mark of a particular class is 12 and the class size is 6. What is the class interval??

Answer 1

Class Mark= Sum of intervals/2

ATQ=> 12= Sum of intervals/2

Sum of intervals= 12 x 2=>24

Class size = Difference of intervals

ATQ=> x-(24-x)=6

=>2x=30

=>x=15

Upper interval= 15

Lower Interval=15-6=>9