There are several commonly used diagrams to represent numerical data, including pictographs, bar graphs, double bar graphs, and pie charts. Pictographs use symbols or pictures to represent data values. Bar graphs display data using uniformly wide bars of varying heights. Double bar graphs show two sets of data simultaneously. Pie charts, also called circle graphs, divide a whole circle into sectors proportional to the parts being represented. These diagrams help represent collected data visually.

1. WEL COME TO MY
MATHEMATICS
FA-4

3. Some commonly used diagrams
to represent numerical data
are:
•Pictographs
•Bar graph
•Double bar graph
•Pie-diagrams or Pie-charts

4. The information
collected in all such
cases is called data

6. Pictographs represent data through
appropriate pictures. In pictographs, the same type of symbol
or picture is used to represent the data. Each symbol is used
to represent a certain value, and this is mentioned clearly in
the graph
Pictographs

7. A display of information using bars of uniform
width, their heights
A bar graph:

8. A bar graph showing two sets of
data simultaneously.

9. Grouped data can be presented using histogram.
Histogram is a type of bar diagram, where the
class intervals are shown on the horizontal axis and
the heights of the bars show the frequency of
the class interval. Also, there is no gap between the
bars as there is no gap between the class
intervals.

10. Histogram

11.  The data regarding choice of subjects showed
the occurrence of each of the entries several
times

12. Circle Graph or Pie Chart
These are called circle graphs.A circle graph
shows the relationship between a
whole and its parts. Here, the whole circle is
divided into sectors. The size of each sector
is proportional to the activity or information it
represents

13. Its representation in a pie diagram is as
shown