# NCERT Class 6 Math՚S Chapter 9: Data Handling: Types of Data

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## Questions? Albert Einstein

1. How to select the scale for bar chart?

2. When to draw bar chart?

3. What is the difference between histogram and bar chart?

## Data Math՚S: Data Math՚S: Data

Consider the data on the height of each of the class students.

## Statistics Math՚S: Statistics Math՚S: Statistics

Using this statistics, we can either plot it (as we will do later) or we can ask questions about data (interpret it)

## Types of Data Types of Data Types of Data

Consider the data on the fruit preferred by each of the class students.

## Concept of Frequency Concept of Frequency
• We start with subtraction - If I have apples and you take 3 from me, then I am left with 2 apples: 5 - 3 = 2.
• The value zero now becomes very important because I know that if I have 5 apples and you take away 5 apples then I am left with none, 0: that is 5 − 5 = 0 Concept of Frequency Concept of Frequency Concept of Frequency Concept of Frequency Concept of Frequency Concept of Frequency Concept of Frequency Concept of Frequency Concept of Frequency Concept of Frequency Concept of Frequency

## Tally Marks Tally Marks

## Concept of Frequency Concept of Frequency

## Tally Marks Tally Marks

## Frequency in Intervals Frequency in Intervals Frequency in Intervals Frequency in Intervals Frequency in Intervals Frequency in Intervals Frequency in Intervals Frequency in Intervals Frequency in Intervals Frequency in Intervals Frequency in Intervals Frequency in Intervals

## Tally Marks in Intervals Tally Marks in Intervals

## Plotting the Frequency Plotting the Frequency Plotting the Frequency

## Bar Chart vs. Histogram Bar Chart vs. Histogram

## Tally Marks- Number of Books Tally Marks - Number of Books

Now we can answer questions like number of books owned by maximum or minimum number of students.

## Overview

• Data and Statistics
• Categorical and Continuous Data
• Frequency & Tally Marks
• Bar Chart vs Histogram
• Drawing Bar Graph
• Choosing Right Scale for Bar Graph
• Vertical and Horizontal Bar Graphs
• Reading Bar Graphs
• Pictographs

## Drawing Bar Graph Drawing Bar Graph

HCF is 200 Drawing Bar Graph Drawing Bar Graph Drawing Bar Graph Drawing Bar Graph Drawing Bar Graph Drawing Bar Graph Drawing Bar Graph Drawing Bar Graph

## The Art of Choosing the Right Scale The Art of Choosing the Right Scale

Not mandatory The Art of Choosing the Right Scale

In first case maximum values are even so we can choose the scale of 2. The Art of Choosing the Right Scale The Art of Choosing the Right Scale The Art of Choosing the Right Scale

## Column Graph or Vertical Bar Graph Column Graph or Vertical Bar Graph

Not mandatory

## Horizontal Bar Graph Horizontal Bar Graph

HCF is 200

## Reading Bar Graphs

1. Maximum production year

2. Minimum production year

3. Largest decrease in production

4. Greatest increase in production Reading Bar Graphs

1. Maximum production year- 2002

2. Minimum production year- 2003

3. Largest decrease in production- 2003 (25)

4. Greatest increase in production 1999,2002 (10)

## Pictographs Pictographs- Approximations
• We start with subtraction - If I have apples and you take 3 from me, then I am left with 2 apples: 5 - 3 = 2.
• The value zero now becomes very important because I know that if I have 5 apples and you take away 5 apples then I am left with none, 0: that is 5 − 5 = 0 Pictographs- Approximations Pictographs- Approximations Pictographs- Approximations Pictographs- Approximations Pictographs- Approximations Pictographs- Approximations

## Pictographs- Approximations Pictographs- Approximations Pictographs- Approximations Pictographs- Approximations Pictographs- Approximations Pictographs- Approximations Pictographs- Approximations

## More Advanced Topics

1. Measures of central tendency (mean, mode, median)

2. Histogram and its statistical properties

3. Pie charts and line graphs

4. Stacked and clustered bar graphs

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