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Organising Data

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Data available to us is in an unorganised form called raw data. 
To draw meaningful inferences, we need to organise the data systematically.
For example, a group of students was asked for their favourite subject. The results were as listed below:
Art, Mathematics, Science, English, Mathematics, Art, English, Mathematics, English, Art, Science, Art, Science, Science, Mathematics, Art, English, Art, Science, Mathematics, Science, Art.
We arrange the data in Table using tally marks.

The number of tallies before each subject gives the number of students who like that particular subject.
This is known as the frequency of that subject.
Frequency gives the number of times that a particular entry occurs.
The table made is known as frequency distribution table as it gives the number of times an entry occurs.

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