Calculating Number of Classes
In a frequency distribution with equal class intervals, the number of classes can be calculated by dividing the Range by:
- Total frequency
- Class mark
- Size of class intervals — Correct Answer
- Number of observations
Explanation:
Correct Answer Explanation
Number of classes = Range ÷ Size of Class Intervals (for equal sized class intervals).
Key Formula:
- Range = Largest value − Smallest value
- Number of classes = Range / Class interval
- Example: Range = 100 (marks 0 to 100), Class interval = 10 → Classes = 100/10 = 10
Key Points:
- The number of classes and the class interval are interlinked — we cannot decide one without the other.
- Recommended number of classes: 6 to 15.
📚 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.
