The probability that a vehicle entering the Luray Caverns has Canadian license plates is

题目

The probability that a vehicle entering the Luray Caverns has Canadian license plates is
0.12; the probability that it is a camper is 0.28; and the probability that it is a camper
with Canadian license plates is 0.09.What is the probability that
(a) a camper entering the Luray Caverns has Canadian license plates?
(b) a vehicle with Canadian license plates entering the Luray Caverns is a camper?
(c) a vehicle entering the Luray Caverns does not have Canadian plates or is not a
camper?

答案

A :CamperB :With Canadian license plates By given hypothesis,P(A) = 0.28,P(B) = 0.12,P(A and B) = 0.09.(a) 0.09.(b) = P( A | B)= P( A and B ) / P(B)= 0.09 / 0.12= 0.75(c) = P( A' or B' )