StatTutor Lesson - The Binomial Setting and Binomial Distributions

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The binomial setting and binomial dist
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      Question 1.

      Is the following situation binomial? Blood type AB negative is the rarest type. An individual with that blood type has just been in a serious automobile wreck, so a blood drive is held. If fifty random donors give blood at the drive, what is the probability of obtaining the needed five units of AB negative blood?

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      		B.
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      		D.
      Correct. There are only two possible outcomes of interest (AB negative or something else); we have fifty donors, so n is fixed; the donors were random (so independent); and the probability in the general population of a person having type AB negative blood is constant. This is a binomial setting.
      Incorrect. There are only two possible outcomes of interest (AB negative or something else); we have fifty donors, so n is fixed; the donors were random (so independent); and the probability in the general population of a person having type AB negative blood is constant. This is a binomial setting.
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