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Math Help - Conditional Probability

  1. #1
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    Conditional Probability

    for question (i) in the attachment,
    the probibility is
    P(Shopped *intersect* Female) = 50/200

    is it correct?
    Attached Thumbnails Attached Thumbnails Conditional Probability-prob-stats.bmp  
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  2. #2
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    Your attachment won't "enlarge" and I have trouble reading it as it is. It appears to be
    *********Shopped*******not Shopped
    Female***** 50 ************150
    Male ****** 75 ************ 225

    The probility that a person "shopped" given that the person is a female would be 50/200 because there are 50+150= 200 people.

    But the probability that a person shopped and was a female- which is "female intersect shopped" and is NOT a "conditional" probability- would be 50/500 because there are a total of 50+150+ 75+ 225= 500.
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  3. #3
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    Quote Originally Posted by HallsofIvy View Post
    But the probability that a person shopped and was a female- which is "female intersect shopped" and is NOT a "conditional" probability- would be 50/500 because there are a total of 50+150+ 75+ 225= 500.
    so.. the word and means intersect & ......given means conditional prob?
    correct?
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  4. #4
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    Quote Originally Posted by nameck View Post
    so.. the word and means intersect & ......given means conditional prob?
    correct?
    Yes.
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