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Thread: Conditional probability answer check

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    Conditional probability answer check




    I just want to check my answer with you guys.

    A supermarket wants to know peoples shopping habits. 250 were surveyed. 60% was females. 70% of all people do shopping on a weekday. 1/3 of the males do their shopping on a weekday rather than on the weekend.

    What is the probability that the person does shopping on the weekend GIVEN its a female?

    MY CONTINGENCY TABLE THAT I DREW OUT


    Is the answer 0.55%
    Last edited by Dason; 10-15-2015 at 09:35 PM.

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    Re: Conditional probability answer check


    It looks like you have the Weekend and Weekday totals switched around. And I don't think you used
    1/3 of the males do their shopping on a weekday rather than on the weekend
    that piece of info correctly.

    And if you're making a table of totals it should be a red flag if you're coming up with numbers that indicate you have things like "92.5 people" (how do you have half of a person?)
    I don't have emotions and sometimes that makes me very sad.

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