Question 868500
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Hi
Recommend making a table to keep track...
Age     % of Pop  %whosmoke   % of Entire Pop for each
Young     .40       .60          .24    (.40*.60)
Middle    .35       .40          .14
Seniors   .25       .20          .05
                                 .43 (sum)
a) a middle aged smoker: P(MA smoker) = .14
 b) a senior non smoker: P(S nonsmoker) = 1 - .05 = .95  0r 95%
 c) a smoker P = .43
 d) a smoker given that he/she is a senior: P = .05/.25
 e) a senior given that he/she smokes:    P =  .05/.43
 f) young or a smoker: P =  .40 + .43 - .24