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  • Card 11 / 13:
    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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Source:  OpenStax, Introduction to statistics i - stat 213 - university of calgary - ver2015revb. OpenStax CNX. Oct 21, 2015 Download for free at http://legacy.cnx.org/content/col11874/1.3
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