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Important Questions

Measures Of Dispersion

ICSE · Class 11 · Economics

Most important questions from Measures Of Dispersion for ICSE Class 11 Economics board exam 2026. MCQs, short answer, and long answer questions with marks.

52 questions40 flashcards5 concepts

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52 Questions·
multiple choicemultiple correct

Sample Questions

1multiple choice
3 marks

A series has X values 5, 7, 9, 11, and 13. What is the standard deviation by actual mean method?

Show answer

2.83

Mean = 9. Deviations are -4, -2, 0, 2, 4. Squares are 16, 4, 0, 4, 16. Sum of squares = 40. SD = √(40/5) = √8 = 2.83.

2multiple choice
3 marks

Using step deviation, values 10, 20, 30, 40, 50, 60, 70 with frequencies 3, 5, 7, 9, 8, 5, 3 and A = 40, C = 10 give what standard deviation?

Show answer

16.5

Step deviation values are -3, -2, -1, 0, 1, 2, 3. Compute Σfd' = 1 and Σfd'² = 109, N = 40. SD = √[109/40 - (1/40)²] × 10 ≈ 16.5.

3multiple choice
3 marks

Two groups have the same mean 53. Group 1 has N = 40 and SD = 19. Group 2 has N = 50 and SD = 8. What is the combined standard deviation?

Show answer

14

Since both means are 53, D1 = 0 and D2 = 0. Combined SD = √[(40×19² + 50×8²) / 90] = √(17640/90) = √196 = 14.

4multiple choice
3 marks

The values 3, 6, 9, 12, and 15 have mean 9. What is the variance?

Show answer

18

Deviations from mean are -6, -3, 0, 3, 6. Squares sum to 90. Variance = average squared deviation = 90/5 = 18.

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What are the important topics in Measures Of Dispersion for ICSE Class 11 Economics?
Measures Of Dispersion covers several key topics that are frequently asked in ICSE Class 11 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
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Understand the core concepts first, then work through the 52 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.
How many important questions are there in Measures Of Dispersion?
There are 52 practice questions available for Measures Of Dispersion. These cover multiple question types including MCQs, short answer, and long answer questions.

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