Question

If the class marks of a frequency distribution are $20,25,30,35,40$ and $45$, find the classes and their width.

• A. $17.5-22.5,22.5-27.5,27.5-32.5,32.5-37.5,37.5-42.5,42.5-47.5$Width of the class is $5$
• B. $17-22,22.5-27.5,28-32.5,33-37.5,38-42.5,43-47.5$Width of the class is $7$
• C. $16-23,23-28.5,278-32,32-38,38-43,43-48$Width of the class is $5$
• D. None of these
  

Answer 1

The correct option is A $17.5-22.5,22.5-27.5,27.5-32.5,32.5-37.5,37.5-42.5,42.5-47.5$

Width of the class is $5$

If the class marks of a frequency distribution are $20,25,30,35,40$ and $45,$ then the width of the class is $25-20=5$.
Classes are $17.5-22.5,22.5-27.5,27.5-32.5,32.5-37.5,37.5-42.5,42.5-47.5$.