O.1250 is the probability that they will purchase no books on this visit to the bookstore.
The area of mathematics known as probability deals with numerical representations of the likelihood that an event will occur or that a statement is true. An event's probability is a number between 0 and 1, where, roughly speaking, 0 denotes the event's impossibility and 1 denotes certainty.
The appropriate response is
Let P(J)
Probability of John to purchase 0 books
Let P(B)
Probability of Beth to purchase 0 books
P(J∩B)
Probability that both john and Beth will purchase 0 books that is a total of 0 books is purchased.
the decisions to purchase books are two independents events,
P(J∩B) = P(J) * P(B)
P(J) = 0.5
P(B) = 0.25
P(J∩B) = 0.5 * 0.25= P(J∩B) = 0.125
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