Question

$0-10,10-20,20-30...$ so on are the classes, the lower boundary of the class $20-30$ is _____

• A. $20$
• B. $21$
• C. $18$
• D. $22$

Answer 1

The correct option is A $20$

Lower boundary means the lower limit of the class interval.
The lower limit of $20-30$ is $20$.