Contingency Table Smoker Non-smoker Total University graduate 36 130 166 Not university graduate 81 174 255 Total 117 304 421 If one employee is selected at random from this company, find the probability that this employee is (a) a university graduate; (b) a non-smoker; (c) a university graduate and a non-smoker; (d) a university graduate or a non-smoker; (e) a smoker given that s/he is a university graduate; (f) not a university graduate given that s/he is a smoker. 2

Contingency Table If one employee is selected at random from this company, find the probability that this employee is ( a ) a university graduate; (b ) a non-smoker; (c ) a university graduate and a non- smoker; (d) a university graduate or a non-smoker; (e) a smoker given that s/he is a university graduate; (f) not a university graduate given that s/he is a smoker