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Revision Notes

Statistics

ICSE · Class 9 · Mathematics

Quick revision notes for Statistics — ICSE Class 9 Mathematics. Key concepts, formulas, and definitions for last-minute revision.

45 questions20 flashcards5 concepts

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Key Topics to Revise

1

Basic Concepts and Variables

  • Statistics comes from Latin word 'Status' meaning political state
  • Used in singular sense: refers to the subject as a branch of knowledge
  • Used in plural sense: refers to numerical data collected systematically
2

Frequency and Frequency Distribution

  • Frequency shows how many times a particular value appears in data
  • Tally marks are used to count frequencies systematically
  • Every fifth tally mark crosses the first four to form bundles of five
3

Class Intervals and Class Limits

  • Class intervals group data into ranges for easier analysis
  • Two types: Inclusive (1-10, 11-20) and Exclusive (10-20, 20-30)
  • Lower class limit is the smaller number, upper class limit is the larger number
4

Cumulative Frequency

  • Cumulative frequency is sum of all frequencies up to and including that class
  • Can be presented as 'less than' cumulative frequency table
  • Each cumulative frequency includes the current class frequency plus all previous

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Full Notes

Key Concepts

A variable is a quantityFrequency is the number of timesClass intervals are ranges of valuesThere are two typesCumulative frequency of a class

Frequently Asked Questions

What are the important topics in Statistics for ICSE Class 9 Mathematics?
Statistics covers several key topics that are frequently asked in ICSE Class 9 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Statistics — ICSE Class 9 Mathematics?
Start by understanding all key concepts. Practise previous year questions from this chapter. Revise formulas and definitions regularly. Use flashcards for quick revision 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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