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

Find the class mark of the class 40 - 45.

Find the class mark of the class 10 -20.

Find the class- mark of the class 35-40.

Find the class mark of the class 0.5 to20.5

(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 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.

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

Choose the correct atternative answer for each of the following question: What is the class mark of the class 30-40 ?