Consider the following information about travelers on vacation (based partly on a Travelocity poll): 40% check work e-mail, 30% use a cell phone to stay connected to work, 25% bring a laptop with them, 23% both check work e-mail and use a cellphone to stay connected, and 51% neither check work e-mail nor use a cell phone tostay connected nor bring a laptop. In addition, 88 out of every 100 who bring a laptop also check work e-mail, and 70 out of every 100 who use a cell phone to stay connected also bring a laptop.

a. What is the probability that a randomly selected traveler who checks work email also uses a cell phone to stay connected?
b. What is the probability that someone who brings a laptop on vacation also uses a cell phone to stay connected?
c. If the randomly selected traveler checked work email and brought a laptop, what is the probability that he/she uses a cell phone to stay connected?