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Statistics

Uttarakhand Board · Class 9 · Mathematics

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

26 questions20 flashcards4 concepts

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A labeled diagram illustrating a bar graph, showing bars of uniform width with equal spacing on one axis (e.g., x-axis) representing categories, and the height of the bars on the other axis (e.g., y-a
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Key Topics to Revise

1

Graphical Representation of Data

  • Graphical representation makes data easier to understand and compare than tabular form
  • One picture is better than a thousand words - visual data is more impactful
  • Three main types: Bar graphs, Histograms, and Frequency polygons
2

Bar Graphs

  • Used for discrete/categorical data
  • Bars have uniform width with equal spacing between them
  • Variable is shown on x-axis, frequency/values on y-axis
3

Histograms

  • Used for continuous class intervals (grouped frequency distribution)
  • Rectangles touch each other with no gaps
  • Width of rectangle = class interval width
4

Frequency Polygons

  • Formed by joining mid-points of upper sides of histogram rectangles
  • Creates a polygon shape when connected with line segments
  • Useful for comparing two different data sets

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Full Notes

Key Concepts

A pictorial representation of data usingA graphical representation of grouped frequencyWhen class intervals have different widthsA line graph formed by joining

Frequently Asked Questions

What are the important topics in Statistics for Uttarakhand Board Class 9 Mathematics?
Statistics covers several key topics that are frequently asked in Uttarakhand Board 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 — Uttarakhand Board 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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