When a customer enters a store there are three outcomes that can occur: buy nothing, buy a small amount, or buy a large amount. It is the case that if a customer buys a large amount, he or she cannot also buy a small amount or buy nothing. We say that these events are
A) disjoint.
B) independent.
C) all inclusive.
D) related.
E) unrelated.

Question

Quizplus · Accepted Answer

Disjoint events are events that cannot happen at the same time. In this case, a customer buying a small amount or buying nothing are not mutually exclusive, but buying a large amount is mutually exclusive with the other two options. Therefore, the events are disjoint.

When a Customer Enters a Store There Are Three Outcomes