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Understanding Data

CBSE · Class 11 · Informatics Practices

Quick revision notes for Understanding Data — CBSE Class 11 Informatics Practices. Key concepts, formulas, and definitions for last-minute revision.

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Key Topics to Revise

1

1. Introduction to Data

  • Data is a collection of characters, numbers, and other symbols that represents values of some situations or variables.
  • Data is plural; the singular form is datum.
  • People use data to make decisions in daily life, business, government planning, banking, sports analysis, and many other fields.
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2. Types of Data

  • Data can broadly be classified into two categories based on format: structured and unstructured.
  • Structured data is usually stored in tabular form with rows and columns.
  • In structured data, each column represents an attribute, characteristic, or variable, and each row represents one observation.
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3. Data Collection and Data Processing

  • Data collection means identifying already available data or collecting it from appropriate sources.
  • Data may already be stored in a register, a digital file, or may need to be collected for a new system.
  • Data can be stored in a CSV file or in a database management system.
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4. Measures of Central Tendency

  • The three common measures of central tendency are mean, median, and mode.
  • These measures help describe a typical or central value of the data.
  • Mean gives the average of numeric values.

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Full Notes

Key Concepts

Data are facts represented using charactersStructured data is organised inUnstructured data does not followMetadata is data about dataData collection means identifying already available

Frequently Asked Questions

What are the important topics in Understanding Data for CBSE Class 11 Informatics Practices?
Understanding Data covers several key topics that are frequently asked in CBSE 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 Understanding Data — CBSE Class 11 Informatics Practices?
Understand the core concepts first, then work through the 92 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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