Adjusted Class Mark Formula
Which of the following is the CORRECT formula for Adjusted Class Mark after applying the continuity correction to inclusive class intervals?
- (Adjusted UCL − Adjusted LCL) / 2
- (Adjusted UCL + Adjusted LCL) / 2 — Correct Answer
- Adjusted UCL × Adjusted LCL
- Adjusted UCL − Adjusted LCL
Explanation:
Correct Answer Explanation
Adjusted Class Mark = (Adjusted Upper Class Limit + Adjusted Lower Class Limit) / 2
Example (Income data):
- Original class: 800–899 → Adjusted: 799.5–899.5
- Adjusted Class Mark = (799.5 + 899.5) / 2 = 1699 / 2 = 849.5
Key Points:
- After adjustment, the class mark formula remains the same structure.
- The adjustment (±0.5) restores continuity of the continuous variable.
📚 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.
