There is a population of three people: xerxes, yasmin, and zoe. [note: this is a population, not a sample.] they are asked how many books they read last month. xerxes read 2 books, yasmin read 4 books, and zoe read 12 books. we are too lazy to poll the entire population, so we take a sample of two (with replacement and order matters). draw the sampling distribution of the mean of a sample of size two.