題目有點長，不好意思
長到我有點判斷不出來這是要用什麼方法作
Consider the following information about travelers on vacation (based partly
on a recent Travelocity poll)
40% check work e-mail
30% use a cell phone
25% bring a laptop with them
23% both check work e-mail and use a cell phone to stay connected
51% neither check work nor use a cell phone to stay connected nor bring
a laptop.
In addition, 88 out of every 100(每100個人中就有88個人) who bring a laptop
also check work e-mail.
70 out of every 100 who use a cell phone to stay connected alse bring a
laptop.
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 check work e-mail and brought a laptop
, what is the probability that he/she uses a cell phone to stay connected?
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