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    Ediese's Avatar
    Ediese Posts: 1, Reputation: 1
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    #1

    Dec 12, 2006, 10:10 AM
    Probability
    A true/false quiz consists of twenty questions. If a student answers the twenty questions by making random guesses, what is the probability of getting at least one correct answer?

    For the second question, subtract from 1 the probability of betting none right in 20 attempts. That will leave you with the probability of getting at least 1 right.
    1 - (1/2)^20 = 1.0

    Is my answer correct?
    Capuchin's Avatar
    Capuchin Posts: 5,255, Reputation: 656
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    #2

    Dec 12, 2006, 10:44 AM
    Yes, but you need to calculate it to more decimal places... the answer should be 0.999999046
    asterisk_man's Avatar
    asterisk_man Posts: 476, Reputation: 32
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    #3

    Dec 12, 2006, 11:50 AM
    Just for kicks:
    1-(1/2)^20=1-1/(1048576)=1048575/1048576=0.99999904632568359375 (exactly)
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