Class 8 Data Handling

Data Analysis and Visualization

Purpose of Bar Graphs

• The primary purpose of a bar graph is to compare categorical data across different groups.

Types of Data

• Discrete data is an example of data that has specific, distinct values, such as the number of students in a class.

Median Calculation

• To find the median of a dataset, first arrange the data in ascending order: 12, 15, 18, 20, 25, 30, 35.
• Since there are an odd number of data points (7), the median is the middle value, which is 20.

Mode Calculation

• The mode of a dataset is the value that appears most frequently.
• In the dataset: 2, 4, 6, 8, 10, 12, 12, 14, the mode is 12, since it appears twice.

Cumulative Frequency Graphs

• The purpose of a cumulative frequency graph is to display the accumulation of frequencies, providing a visual representation of the total frequency up to a certain point in the data.