
David W. answered 06/19/16
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Experimental Probability = (the number of actual successes) / (the number of possible outcomes)
Theoretical Probability = (the number of possible successes) / (the number of possible outcomes)
To determine the experimental probability, an experiment must be carried out and the results observed. For a 6-sided die, a result of either 1,2,3,4 or 5 means "not a 6." Thus counting these allows you to compute this probability.
Theoretically, getting "not 6" has a probability of 5/6.
Note that many, many experiments might need to be carried out to achieve an experimental probability that even begins to approach the theoretical probability, but that is what we would expect. It is possible (but less and less likely) that they are never equal.