a. The average math achievement test score of the population of eighth graders in a large city is known to be 100. You have selected a child at random. Her score turns out to be 110. You select a second child at random. What do you expect his or her score to be?
b. The average reading achievement test score of the population of eighth graders in a large city is known to be 100. You have selected 50 children randomly. The first child tested has a score of 150. What do you expect the mean score to be for the whole sample.