NCERT Class 6 Math՚s Chapter 9: Data Handling: Types of Data
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Questions?
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
Consider the data on the height of each of the class students.
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
Consider the data on the fruit preferred by each of the class students.
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
Tally Marks
Concept of Frequency
Tally Marks
Frequency in Intervals
Tally Marks in Intervals
Plotting the Frequency
Bar Chart vs. Histogram
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
HCF is 200
The Art of Choosing the Right Scale
Not mandatory
In first case maximum values are even so we can choose the scale of 2.
Column Graph or Vertical Bar Graph
Not mandatory
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
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
- 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
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
✍ Mayank