Recommended Number of Classes
The usual number of classes in a frequency distribution is between:
- 2 and 5
- 6 and 15 — Correct Answer
- 15 and 30
- 20 and 50
Explanation:
Correct Answer Explanation
The number of classes in a frequency distribution is usually between six and fifteen.
Key Points:
- Number of classes = Range / Class Interval (for equal class intervals).
- Too few classes → suppresses information.
- Too many classes → data becomes fragmented and difficult to analyse.
- The choice of number of classes and class interval are interlinked decisions.
- Example: Range = 100, Class Interval = 10 → Number of classes = 100/10 = 10 classes.
📚 About this Topic — CH-3: Organisation of Data
This multiple choice question is from CH-3: Organisation of Data, NCERT Books, Statistics for Economics. It has 4 options with a detailed explanation of the correct answer. Practice more MCQs from CH-3: Organisation of Data to strengthen your preparation.
