Suppose that a probability is approximated to be zero based on empirical results. Does this mean that the event is​ impossible?
An event is unusual if it has a low probability of occurring. The choice of a cutoff should consider the context of the problem.

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The complement of​ E, denoted Ec​, is all outcomes in the sample space S that are not outcomes in the event E.
If E and F are independent​ events, then the probability​ P(E and​ F) is given by the formula below.

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Two events E and F are​ ________ if the occurrence of event E in a probability experiment does not affect the probability of event F.
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