Class Mark of 45-50 in Unequal Distribution
In the unequal class interval distribution (Table 3.7), what is the class mark of the class 45–50?
- 45
- 47
- 47.5 — Correct Answer
- 50
Explanation:
Correct Answer Explanation
Class Mark of 45–50 = (45 + 50) / 2 = 95 / 2 = 47.5.
Unequal Class Marks (Table 3.7):
- 40–45: 42.5, 45–50: 47.5
- 50–55: 52.5, 55–60: 57.5
- 60–65: 62.5, 65–70: 67.5
Why These Are Better:
New class marks (e.g., 47.5) are more representative of the actual data than old class mark (45 for class 40–50), because the new marks are closer to where the observations actually concentrate.
📚 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.
