Find the class mark of the class 10 -20.

(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.

Find the class mark of the class 80-90.

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

The class mark of the class 100-120 is

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

Find the class mark of the class 35-39 . What is the next consecutive class ?

The class mark of the class 90-120 is

The class mark of the class 150 - 170 is

What is the class mark of the class 100 - 190 ?

Write the class mark of the class 19.5 - 29.5 .