Statistics Grade 9 CBSE

Data can be defined as a collection of facts such as values or measurements. It can be of two types – Qualitative (provides descriptive information) or Quantitative (provides numerical information and can be either discrete or continuous). There are 2 topics that are covered under this section:

  1. Statistics – Introduction
  2. Probability

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Statistics
Key topics include:

  • Basics
  1. Statistics
  2. Data
  3. Properties of Data
  4. Limitation of Statistics
  • Types of Data
  1. Primary Data
  2. Secondary Data
  3. Raw or Ungrouped Data
  4. Grouped Data
  5. Array
  6. Representation of Data
  7. Frequency of Data
  8. Frequency Distribution of an Ungrouped Data
  9. Exclusive Form of Frequency Distribution
  10. Inclusive Form of Frequency Distribution
  • Some Important Definitions
  1. Variable or Variate
  2. Class Interval
  3. True Upper and True Lower
  4. Class Size
  5. Class Mark of a Class
  6. Range
  7. Cumulative Frequency
  • Graphical Representation of Data
  1. Bar Graph
  2. Histogram
  3. Frequency Polygons
  • Measurement of Average
  1. Arithmetic Mean
  2. Properties of Arithmetic Mean
  • Methods to Calculate Arithmetic Mean
  • Median
  1. Definition
  2. Median for Individual Data
  3. Median for Grouped Data
  • Mode
  1. Definition
  2. Mode for Individual Data
  • Relationship Between Mean, Median & Mode

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Probability
Key topics include:

  • Introduction
  1. Trial
  2. Experiment
  3. Random Experiment
  4. Event
  5. Sample Space
  6. Set of Favors
  • Empirical (Experimental) Probability

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