Problem
The 2010 American Community Survey estimates that 47.1% of women aged 15 years and over are married.
(a) Randomly select three women between these ages. What is the probability that the third woman selected is the only one that is married?
(b) What is the probability that all three women are married?
(c) On average, how many women would you expect to sample before selecting a married woman? What is the standard deviation?
(d) If the proportion of married women was actually 30%, how many women would you expect to sample before selecting a married woman? What is the standard deviation?
(e) Based on your answers to parts (c) and (d), how does decreasing the probability of an event affect the mean and standard deviation of the wait time until success?