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Thread: Bayes's Theorem

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    Question Bayes's Theorem




    Hi!

    Say there is a deck of 100 cards:

    Red w/ numbers = 40
    Red w/ figures=15
    Black w/ numbers=35
    Black w/ figures=10

    The only information known is that 55% of the cards are red and 45% of the cards are black and 75% of the cards have numbers and 25% of the cards have figures. That is the above-referenced number of cards is not known.

    How one would apply Bayes’ Theorem to calculate the probability of a card being red w/ numbers? From the information given, the answer is 40%.

    Thank you!

    Dr. T.
    Last edited by DrAnthonyRodriguez; 05-22-2015 at 10:28 AM.

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    Re: Bayes's Theorem

    You don't need Bayes theorem for that. There are 40 cards that are red w/ numbers out of 100 total. 40/100 is 40%.
    I don't have emotions and sometimes that makes me very sad.

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    Re: Bayes's Theorem

    Quote Originally Posted by Dason View Post
    You don't need Bayes theorem for that. There are 40 cards that are red w/ numbers out of 100 total. 40/100 is 40%.
    Dason,

    Thank you for your reply.

    I was not clear. I meant to find out the probability is only the percentages but not the number of cards is known.

    Dr. T.

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    Re: Bayes's Theorem

    Maybe try rewriting your whole problem? It's not clear to me what you actually mean.
    I don't have emotions and sometimes that makes me very sad.

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    Re: Bayes's Theorem


    It appears that percentages alone cannot be used to calculate the probability.

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