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Math Help - Probability

  1. #1
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    Probability

    After a particularly brillant Super Bowl ad , a company believes that 78% of all adults ( 18 and older) recognize their brand.

    a. If we sample adults, whats the probability that the first or the second does not recognize their brand?

    b. If we sample adults, what is the probability that the 3rd person asked is the first one who doesnt recognize the brand?

    Please help by showing me how to figure this out......Thanks
    Last edited by TLC918; April 12th 2008 at 03:04 PM. Reason: Wrong spelling
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  2. #2
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    Quote Originally Posted by TLC918 View Post
    After a particularly brillant Super Bowl ad , a company believes that 78% of all adults ( 18 and older) recognize their brand.

    a. If we sample adults, whats the probability that the first or the second does not recognize their brand?

    b. If we sample adults, what is the probability that the 3rd person asked is the first one who doesnt recognize the brand?

    Please help by showing me how to figure this out......Thanks
    a. 0.22 + (0.78)(0.22) = ....
    b. (0.22)(0.22)(0.78) = ...

    From the above you should be able to:
    1. Do the arithmetic to get the answers.
    2. Reverse engineer the reasoning that lead to the answers.
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