Question 668477
say there are 5 male undergraduates, 2 female undergrduates, 2 male graduates, and 2 female graduates. find the probability of selecting an undergraduate or a female? i thought it was (7+4)/11 but thats just one ...
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P(undergrad OR female) = P(undergrad) + P(female) - P(undergrad AND female)
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= [7 + 4 - 2]/11 = 9/11
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Cheers,
Stan H.