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Measures Of Dispersion

ICSE · Class 11 · Economics

Quick revision notes for Measures Of Dispersion — ICSE Class 11 Economics. Key concepts, formulas, and definitions for last-minute revision.

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Key Topics to Revise

1

Meaning and Need of Dispersion

  • Dispersion shows the scatteredness or variation of values in a series.
  • It is used in two senses: variation among items, and average difference from the mean.
  • A single average does not always represent all observations well.
2

Types of Measures of Dispersion

  • Absolute measures are expressed in the same unit as the data, such as rupees, kilograms, or years.
  • Relative measures are coefficients or percentages and do not depend on the unit of measurement.
  • Absolute measures include range, quartile deviation, mean deviation, and standard deviation.
3

Range and Coefficient of Range

  • Range is the simplest measure of dispersion.
  • It is the difference between the largest and smallest value of a series.
  • Range is not based on all values.
4

Quartile Deviation, Inter-Quartile Range, and Percentile Range

  • Inter-quartile range shows the spread of the middle 50% of data.
  • Inter-quartile range is Q3 - Q1.
  • Quartile deviation is half of the inter-quartile range.

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Full Notes

Key Concepts

Dispersion is the scatteredness or spreadAbsolute measures are expressed inRange is the difference betweenQuartile deviationMean deviation is the arithmetic average

Frequently Asked Questions

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.
How to score full marks in Measures Of Dispersion — ICSE Class 11 Economics?
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.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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