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 

RELATED QUESTIONS

Certain class contains 60% of boys and 40% of girls, all aged between 17 and 27 years. It  (answered by Boreal)

certain class contains 60% of boys and 40% of girls, all aged between 17 and 27 years. It  (answered by natolino_2017)

5. A company has 10,000 clients. Each client is classified as (i) young or old; (ii) male  (answered by CPhill)

In a survey concerning the smoking habits of consumer it was found that 55% smoke... (answered by ikleyn)

A study found that 1% of Social Security recipients are too young to vote. If 800 Social... (answered by Boreal)

A preliminary survey shows that 35% of college students smoke. In a class of 42 students,  (answered by stanbon)

In a survey concerning the smoking habits of consumer it was found that 55% smoke... (answered by joshua2022)

Blue Nile University recently conducted a survey of undergraduate students in order to... (answered by ikleyn)

When rats give birth, the weight of each baby varies inversely with the number of young.... (answered by stanbon)