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Presentation of Data

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Example : Consider the marks obtained by 10 students in a mathematics test as given below: 
55  36  95  73  60  42  25  78  75  62 
The data in this form is called raw data.
So let us arrange the marks in ascending order as 
25  36  42  55  60  62  73  75  78  95 
Now, we can clearly see that the lowest marks are 25 and the highest marks are 95.
The difference of the highest and the lowest values in the data is called the range of the data. So, the range in this case is 95 – 25 = 70.
Presentation of data in ascending or descending order can be quite time consuming, particularly when the number of observations in an experiment is large.
The frequency is the number of times a particular data point occurs in the set of data. A frequency distribution is a table that list each data point and its frequency. Ungrouped data is data given as individual data points.Grouped data is data given in class  intervals.

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