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  • Raw data is a collection of observations, which are not organised.
  • The difference between the highest and lowest observations in a data is called the range of the data.
  • The number of times a particular observation occurs in a given data is called its frequency.   
  • A frequency distribution is a table that shows how frequently a particular item occurs in a group.
  • When the number of observations is high, the data is grouped into convenient class intervals.
  • The difference between the upper and lower class limits is called the class size.   
  • The mid-value of a class interval is called the class mark.
  • Class intervals may be overlapping or non overlapping, depending on the type of data collected.   
  • A histogram is a graphic representation of grouped data. It consists of rectangles with class intervals as the bases and the corresponding frequencies as heights.
  • An experiment is a situation involving chance or probability that leads to results
  • An outcome is the result of a single trial of an experiment.
  • An event is one or more outcomes of an experiment.

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