This chapter introduces students to the collection, organisation, representation, and interpretation of data. Students learn how information can be gathered from daily life situations and represented using tables, tally marks, pictographs, and bar graphs.
It covers:
• Collection and organisation of data
• Frequency tables and tally marks
• Sorting and arranging data
• Pictographs and their interpretation
• Drawing pictographs using scales
• Bar graphs and their construction
• Reading and interpreting graphs
• Choosing suitable scales for graphs
• Comparing information visually
• Real-life applications of data handling
The chapter includes many activities based on favourite games, sweets, transport, trees, school attendance, traffic, and surveys to help students understand data through practical examples.
Overall, this chapter develops observation skills, analytical thinking, graphical understanding, and the ability to interpret information from charts and tables used in daily life.
🔑 Key Points
• Data – A collection of facts, numbers, observations, or information.
• Data Collection – Gathering information from people, objects, or observations.
• Organisation of Data – Arranging collected data systematically.
• Frequency – Number of times a particular item appears.
• Frequency Table – A table showing items and their frequencies.
• Tally Marks – Quick counting marks used to record frequencies.
• Group of Five – The fifth tally mark crosses the previous four tally marks.
• Ascending Order – Arranging data from smallest to largest.
• Descending Order – Arranging data from largest to smallest.
• Pictograph – Representation of data using pictures or symbols.
• Key/Scale in Pictograph – Tells what one symbol represents.
• Half Symbol – Sometimes used when values are not exact multiples of the scale.
• Bar Graph – Graph using rectangular bars to represent data.
• Equal Width Bars – All bars in a bar graph must have equal width.
• Equal Spacing – Bars should have equal gaps between them.
• Scale – Decides how much one unit length represents.
• Vertical Axis – Shows frequencies or values.
• Horizontal Axis – Shows categories or items.
• Interpretation of Graphs – Understanding information from charts and graphs.
• Comparison Using Graphs – Graphs help compare quantities quickly.
• Real-Life Data – Data is used in schools, traffic studies, sports, weather reports, and surveys.
👉 👉 Data and graphs help us organise information clearly and make better decisions. By observing and analysing data carefully, we can understand patterns and solve real-life problems effectively.