If the class intervals of a frequency distribution are `1-10, 11-20, 21-30, ….,51-60` then the size of even class is

If the class intervals of a frequency distribution are 1-10, 11-20, 21-30, …., 61-70 , Then the upper limit of 21-30 is

The mid-values of the class-intervals of a frequency distribution are respectively 15,20,25,30,…… The class interval of which the mid-value is 20 is

The class marks of a frequency distribution are 15, 20, 25, 30, ..... The class corresponding to the class mark 25 is

The mid-values of the class-intervals of a frequency distribution are respectively 11,14,17,20…… The class interval of which the mid-value is 17 is

If 1-5 , 6-10 , 11-15 , ..., are the classes of a frequency distribution , then the size of the class is "_______" .

The mid-value of a class-interval of a frequency distribution is 10 and the class-length of each class is 6, The lower class limit of the class-interval is

(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.

If 1-10, 11-20, 21-30, 31-40, ......., are the classes of a frequency distribution, then the upper boundary of the class 31-40 is _____.

Class intervals in a grouped frequency distribution are given as 4-11, 12 – 19, 20-27, 28-35, 36-43. Write the next two class intervals.