Mathematics, 02.02.2021 04:00 kob3965
21. Eighty - two percent of people using electronic cigarettes ( vapers ) are ex - smokers of conventional cigarettes . You randomly select 10 vapers . Find the probability that the first vapers who is an ex - smoker of conventional cigarettes is ( a ) the second person selected , ( b ) the fourth or fifth person selected , and ( c ) not one of the second through seventh persons selected . ( Source : Churn Mag )
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21. Eighty - two percent of people using electronic cigarettes ( vapers ) are ex - smokers of conven...
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