NCERT Class 8 Mathematics Chapter 5 Data Handling CBSE Board Sample Problems
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Data Handling
Sr. no  Term  Description 
2  Data  A systematic record of facts or different values of a quantity is called data. Data mostly available to us in an unorganized form is called raw data. 
3  Features of data 

4  Bar graph  A bar graph is a pictorial representation of data in which rectangular bars of uniform width are drawn with equal spacing between them on one axis, usually the x axis. The value of the variable is shown on the other axis that is the y axis. 
5  Histogram  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. 
6  Circle Graph or piechart  A circle graph shows the relationship between a whole and its part 
Change or Probability
Sr. no  Term  Description 
1.  Random experiment  A random experiment in one whose outcome cannot be predicted exactly in advance 
2.  Equally Likely outcome  Outcomes of an experiment are equally likely if each has the same chance of occurring 
3.  Event  One or more outcomes of an experiment make an event. 
4.  Probability  Probability of an event This is applicable when the all outcomes are equally likely 