445 of male students are smokers & 445 are non-smokers. Of the female students, 80 are smokers & 720 are non-smokers. A male student & a female student from the college r randmly slected. What s the prbability tht both r non-smokers

Probability of a male non-smoker is 1/2

Probability of female non-smoker is 720/800 = 72/80 = 9/10

Probability BOTH are non-smokers is (1/2)(9/10) = 9/20

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