Class Mark of 40-45 in Unequal Distribution
What is the class mark of the class 40–45 in the unequal class interval frequency distribution?
- 40
- 42.5 — Correct Answer
- 45
- 43
Explanation:
Correct Answer Explanation
Class Mark of 40–45 = (40 + 45) / 2 = 85 / 2 = 42.5.
Comparison — Old vs New Class Marks:
- Old class 40–50 → Class Mark: 45
- New class 40–45 → Class Mark: 42.5 (observations: 42, 44, 40, 44, 41, 40, 43, 40, 41 — mostly cluster around 42–43)
- New class 45–50 → Class Mark: 47.5 (observations: 47, 49, 49, 45, 45, 47, 49, 46, 48, 48, 49, 49 — cluster around 47–49)
The split class marks are clearly more representative.
📚 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.
