Data Handling Summary Class 6 Maths Chapter 4

Data

• A data is a collection of numbers gathered to give some information.
• Raw data: Data obtained in the original form is called raw data.
• Array: Arranging the numerical figures in an ascending or a descending order is called an array
• Observations: Each numerical figure in a data is called an observation.
• Tabulation of data : Arranging the data in a systematic tabular form is called tabulation or presentation of the data.

Recording and Organising Data

• Data can be collected from different sources.
• Ekta is asked to collect data for size of shoes of students in her Class VI. Her finding are recorded in the manner shown below:
  

Ekta prepared a table using tally marks. 

Pictograph

• A pictograph represents data through pictures of objects. It helps answer the questions on the data at a glance.

A Bar Graph

• Bars of uniform width can be drawn horizontally or vertically with equal spacing between them and then the length of each bar represents the given number. This method of representing data is called a bar diagram or a bar graph.