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  1. #1
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    What is the probability of...

    Here is the data to answer the question below:

    Short Sleeve:163 that are blue and 295 that are not blue
    Non Short Sleeve: 49 that are blue and 123 that are not blue



    If 1 student is randomly selected, find the probability of getting someone who did not wear blue or wore a non-shot-sleeve shirt.

    Is it [418+172]/630 = 0.9365 or is it [418+49]/630 = 0.7413.

    The first answer is my answer. The second is the answer key.

    SOS
    Last edited by DINOCALC09; December 16th 2008 at 03:26 AM. Reason: formating error
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  2. #2
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    Quote Originally Posted by DINOCALC09 View Post
    Here is the data to answer the question below:

    Short Sleeve:163 that are blue and 295 that are not blue
    Non Short Sleeve: 49 that are blue and 123 that are not blue



    If 1 student is randomly selected, find the probability of getting someone who did not wear blue or wore a non-shot-sleeve shirt.

    Is it [418+172]/630 = 0.9365 or is it [418+49]/630 = 0.7413.

    The first answer is my answer. The second is the answer key.

    SOS
    A Karnaugh table makes it clear:

    \frac{295 + 123 + 49}{630} is the answer. You are double counting not blue and not short sleeve ....
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