Question

Definition of true class limits. .........

Answer 1

Class limits. There are two for each class.
The lower class limit of a class is the smallest data value that can go into the class.
The upper class limit of a class is the largest data value that can go into the class.
Class limits have the same accuracy as the data values; the same number of decimal places as the data values.

Class boundaries. They are halfway points that separate the classes.
The lower class boundary of a given class is obtained by averaging the upper limit of the previous class and the lower limit of the given class.
The upper class boundary of a given class is obtained by averaging the upper limit of the class and the lower limit of the next class.

Class marks. They are the midpoints of the classes.
They are obtained by averaging the limits.