There is a subway car with adjacent seats in a row. People walk into the subway and choose a random available seat (drawn uniformly). The only constraint on seat availability is that they do not like to sit next to one another so there is always (at least) one empty seat between any two individuals. This process continues until all available seats are taken.
What is the mean and standard deviation of the fraction of occupied seats (when the process is complete) for different values of , try = 25, 100, and 1000.