- 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
- Pie chart
- Construction of grouped frequency distribution table:
There are two ways to group the data to make frequency distribution table. These are as follows:
Inclusive method (Discontinuous form):
The classes can be defined in inclusive method as 1 - 10, 11 - 20, 21 - 30 and 31 - 40. Here, both limits are inclusive in each class.
Exclusive method (Continuous form):
In exclusive method, we take the class intervals as 0 – 10, 10 – 20, 20 – 30. The observ…
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