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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.

41 questions30 flashcards5 concepts

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An illustration comparing raw (ungrouped) data, arrayed data (sorted), and tabulated data (organized in a basic table with categories and totals).
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Key Topics to Revise

1

1. Data, Statistics, and Variable

  • A set of collected numerical facts is called a set of data.
  • Statistics is used in two different senses: singular and plural.
  • As a singular term, Statistics means the whole subject dealing with collecting, analysing, and interpreting data.
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2. Tabulation, Frequency, and Frequency Distribution

  • Tabulation means arranging data in a table.
  • A frequency tells how many times a particular data value appears in a set of data.
  • Frequency distribution is a tabular arrangement of data showing corresponding frequencies.
3

3. Grouped Frequency Distribution and Class Intervals

  • Grouped frequency distribution uses class intervals instead of single values.
  • There are two types of frequency distributions in general: inclusive and exclusive.
  • In an inclusive distribution, the upper limit of one class does not coincide with the lower limit of the next class.
4

4. Class-Size and Class-Mark

  • Class-size is the difference between the actual lower limit and actual upper limit of a class interval.
  • Class-mark is the value midway between the actual lower limit and actual upper limit.
  • Class-mark is also called mid-value.

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Full Notes

Key Concepts

Statistics has two meaningsA set of collected numerical factsA quantity which can vary fromA variable which can take anyA variable which is incapable

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?
Understand the core concepts first, then work through the 41 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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