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SAI International School
                                                      CLASS-VI

               Mathematics
               CHAPTER-9: Data Handling
               Lesson Notes-1


               SUBTOPIC: Introduction of Data Handling

               Data: Data is a collection of numerical information gives information.

               Raw Data: The original form of data or the data which is not organized properly are
               called the raw data.
               Primary  Data:  Primary  data  is  information  collected  through  original  or  first-hand
               research. For example, surveys and focus group discussions.

               Secondary  Data:  Secondary  data  is  information  which  has  been  collected  in  the
               past  by  someone  else.  For  example,  researching  the  internet,  newspaper  articles
               and company reports.
               Recording  Data:  Recording  of  data  depends  upon  the  requirement  of  the  data.
               Everybody has different ways to record data.
               Organization of Data: Raw data is difficult to read, so we have to organize it.

                     Data can be organized in a tabular form.
                     Data is represented in a tabular form using frequency distribution and the tally
                       marks.
               Frequency:  It tells the number of times the particular observation happened.
               Tally marks: These are used to show the frequency of the data.
               Tally marks are represented as:
























               We can see here;


                     One is expressed by ‘|’ tally marks.
                     Two one is represented by ‘| |’ tally marks.
                     Three is represented by ‘| | |’ tally marks.
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