Mutually exclusive events - events that cannot occur at the same time. , Complementary events of set E - is the set of all elements that are not in E., P(E)=1 - event is certain (it has to happen)., P(E)=0 - the event is impossible., 0 ≤ P(E ) ≤ 1 - The sum of all (mutually exclusive) probabilities is 1., Relative frequency - is the number of times an outcome happens compared to the total number of trials., We can write relative frequency - as a fraction, ratio, decimal or percentage.,

Probability 7.2 & 7.3

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