Question

Consider the following statements in respect of class intervals of grouped frequency distribution
1. Class intervals need not be mutually exclusive.
2. Class intervals should be exhaustive.
3. Class intervals need not be of equal width.
Which of the above statements are correct?

• A. $1$ and $2$ only
• B. $2$ and $3$ only
• C. $1$ and $3$ only
• D. $1$, $2$ and $3$

Answer 1

The correct option is B $2$ and $3$ only

While arranging large amount of data (in statistics), they are grouped into different classes to get an idea of the distribution, and the range of such class of data is called the Class Interval.

Class intervals are generally equal in width and are mutually exclusive.
The ends of a class interval are called class limits, and the middle of an interval is called a class mark.