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Card 20 / 25:
According to the American Red Cross, about one out of nine people in the U.S. have Type B blood. Suppose the blood types of people arriving at a blood drive are independent. In this case, the number of Type B blood types that arrive roughly follows the Poisson distribution.
If 100 people arrive, how many on average would be expected to have Type B blood?What is the probability that over 10 people out of these 100 have type B blood?What is the probability that more than 20 people arrive before a person with type B blood is found?
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