Probability Concepts

Before we give a definition of probability, let us examine the following concepts:

1. Random Experiment : An experiment is a random experiment if its outcome cannot be predicted precisely. One out of a number of outcomes is possible in a random experiment.  A single performance of the random experiment is called a trial.
                        
2. Sample Space : The sample space is the collection of all possible outcomes of a random experiment. The elements of are called sample points.



• A sample space may be finite , countably infinite or uncountable.



• A finite or countably infinite sample space is called a discrete sample space.



• An uncountable sample space is called a continuous sample space