16. A real estate agent wishes to estimate the mean number of days on the market of all houses sold in the last two years in Mecklenburg County. To do

so, he examines the sales data of fifty randomly selected houses sold in that period. The population of interest to the agent is: (a) All houses sold in Mecklenburg County in the last two years. (b) All houses sold that were not in the sample. (c) The fifty houses in the sample. (d) All houses sold except the fifty in the sample. (e) None of the above.