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Card 12 / 14:
According to a recent Pew Research poll, 75% of millenials (people born between 1981 and 1995) have a profile on a social networking site. Let X = the number of millenials you ask until you find a person without a profile on a social networking site.
Describe the distribution of X .Find the (i) mean and (ii) standard deviation of X .What is the probability that you must ask ten people to find one person without a social networking site?What is the probability that you must ask 20 people to find one person without a social networking site?What is the probability that you must ask at most five people?
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