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Data Handling

  • In a pictograph, pictures of objects are used for representing data. Tally marks cannot be used for representing huge numbers. However, these numbers can be represented with the help of pictographs.
  • Data can also be represented by using bar diagram or bar graph. In a bar graph, bars of uniform width are drawn horizontally or vertically. These bars are placed at equal distance from each other. The length of each bar gives the required information.
  • The data in an unorganised form is called raw data. In order to draw meaningful inferences from a data, we need to organise the data systematically.

We can organise a data in the following ways:

    • Frequency distribution table
    • Histogram
    • Pie chart


Data is defined as a collection of numbers which give the required information. For example, marks scored by the students in a class, number of members in a family, number of books sold etc.

Data are of two types:

(i) Primary data: It is the data collected by the person directly for a specific purpose without referring any source. Primary data is collected through surveys, local sources etc.

(ii) Secondary…

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