CBSE Class 7 Maths Ch- Data Handling
Data handling is the process of collecting, recording, and analyzing data to extract meaningful information.
Types of Data
1. Raw Data: Unorganized and unprocessed data.
2. Arrayed Data: Data arranged in a systematic order.
Methods of Data Collection
1. Observation: Collecting data by observing things around us.
2. Survey: Collecting data by asking questions.
3. Experiment: Collecting data by conducting experiments.
Representation of Data
1. Bar Graph: A graph using bars to represent data.
2. Pie Chart: A circular chart divided into sectors to represent data.
3. Pictograph: A graph using pictures to represent data.
4. Double Bar Graph: A graph using two sets of bars to compare two sets of data.
Double Bar Graph
A double bar graph is used to compare two sets of data. It has two axes:
1.X-axis: Represents the categories or groups.
2. Y-axis: Represents the values or quantities.
Features of a Double Bar Graph
1. Two sets of bars: Each set represents a different set of data.
2. Same x-axis: Both sets of bars share the same x-axis.
3. Same y-axis: Both sets of bars share the same y-axis.
4. Comparison: Allows for easy comparison between the two sets of data.
Interpretation of a Double Bar Graph
1. Compare values: Compare the values of the two sets of data for each category.
2. Identify trends: Identify trends and patterns in the data.
3. Make conclusions: Make conclusions based on the comparison of the two sets of data.
Key Concepts
1. Mean: Average of a set of numbers.
2. Median: Middle value of a set of numbers.
3. Mode: Most frequently occurring value in a set of numbers.
Formulae
1. Mean: (Sum of all observations) / (Total number of observations)
2. Median: Middle value of a set of numbers when arranged in order.
Practice Questions
1. Create a double bar graph to compare the scores of two teams in a cricket match.
2. Interpret the data represented in a given double bar graph.
3. Find the mean and median of the following set of numbers: 2, 4, 6, 8, 10.
folloing worksheet and Test paper are helpful resourse for the students.
https://t.me/cgscbsesupportbypramodsir/4
https://t.me/cgscbsesupportbypramodsir/5
0 Comments