The class are 10-20,20-30,30-40,….. What is the class interval of each class?

The width of the class interval 20- 30 is

For overlaping classes 0-10,10-20,20-30, etc.Then the class mark of the class 0-10 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.

In the class intervals 10-20, 20-30, 20 is taken in the interval 10-20 (b) the interval 20-30 both intervals 10-20, 20-30 (d) none of the intervals

If the classes are 0-10, 10-20,20-30… then in which class should the observation 10 be inclused?

If the classes are 0 -10 , 10-20, 20-30…., then in which class should the observation 10 be included ?

In a frequency distribution with classes 0-10, 10-20 etc., the size of the class intervals is 10. The lower limit of fourth class is

0-10 , 10 - 20 , 20 - 30 , ...., are the classes , the lower boundary of the class 20-30 is "_______" .