Question

Which one of the following groups has different class size from others?

• A. $120-125$
• B. $243-249$
• C. $141.5-146.5$
• D. $315.5-320.5$

Answer 1

The correct option is B $243-249$

Class size $=$ Upper limit $-$ lower limit
All other classes have a class size $=5$ except, $243-249$ which has a size of $6$