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The Complete Idiot's Guide to Statistics, 2nd Edition by Robert Donnelly

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The Union of Events: A Marriage Made in Heaven

The union of Events A and B represents all the instances where either Event A or Event B or both occur and is denoted as A ∪ B. Using our previous example, the following table shows the four combinations that include either a call from Christin or a crisis phone call.
158
Therefore, the probability that the next phone call is either from Christin or is a crisis is as follows:
159
def•i•ni•tion
The union of Events A and B represents the number of instances where either Event A or B occur (that is, ...

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