According to a recent poll, 75 percent of millennials (people born between 1981 and 1995) have a profile on a social networking site. Let X = the number of millennials 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 10 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?
OpenStax Statistics, 4.4 Geometric Distribution (Optional), exercise 24