Find the class marks of classes 10-25 and 35-55.

Find the class marks of the classes 15 - 35 and 45 - 60.

Find the class mark of the class 10 -20.

Find the class mark of the class 80-90.

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

Find the class mark of class 21.5 to 25.5

Find the class-mark of 80-90.

The class mark of the class 100-120 is

Find the class-marks of the class interval 10-25.

(i)Find the class mark of the class 90-120. (ii)In a frequency distribution, the mid-value of the class is 10 and width of the class is 6. Find the lowe limit of the class. (iii)The width of each of the five continuous classes in a frequency distribution is 5 and lowe class limit of the lowest class is 10. What is the upper class limit of the highest class? (iv) The class marks of a frequency distribution are 15,20,25...... Find the class corresponding to the class mark 20. (v)In the class intervals 10-20, 20-30, find the class in which 20 is included.

The class mark of the class 90-120 is