Question

the mid value of class interval is called what?​

Answer 1

The class interval is the distance between the upper and lower class limits. The size of the class interval for the first class, for example, is 30 – 21 = 9. Similarly, the size of the second class interval is 40 – 31 = 9.

So we can say that the mid point of a class interval is called the class mark.

Answer 2

The mid value of class interval is called class mark.

Class mark is defined as the mean of the lower limit and upper limiit. Hence, the mid point of a class interval is called the class mark.