Write the (i) lower boundary and (ii) upper boundary of the class 20-30, if the classes are 10-20, 20-30, 30-40,…… .

The upper limit of the class 30-40 is

Find the class mark of the classes 20 − 30 and 30 − 40.

Calculate the boundaries of the class interval in the above table 10-20,20-30.

The width of the class interval 20- 30 is

Find the actual lower and upper class limits and also the class marks of the classes : 1.1 - 2.0, 2.1 - 3.0 and 3.1 - 4.0.

Write the upper class limit and the lower class limit of the class 20 - 30.

The upper limit of class interval 20-30 is:

Define: class-boundary , lower and upper class boundaries

Find the actual lower class limits , upper class limits and mid values of the classes : 10 -19 , 20 - 29 , 30 - 39 , and 40 - 49