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 data: It is the data collected through other sources like research organizations, financial institutions etc.
The original form of data is called raw data. But when the data is arranged in ascending or descending order, it is referred to as array.
For example, let us consider the following data.
Name of the student
Marks obtained (out of 100)
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