The relationship between marginal and average costs

Suppose Hubert is a professional basketball player, and his game log for free throws can be summarized in the following table.

Complete the following table by calculating Hubert's free throw percentage for each game and his overall free throw average.

Game	Game Result	Total	Game Free Throw Percentage	Average Free Throw Percentage
(Percent)	(Percent)
1	4/5	4/5	80	80
2	2/5	6/10
3	1/4	7/14
4	1/2	8/16
5	4/4	12/20

Plot the results for each game and Hubert's overall average free throw percentage after each game on the following graph. Use the orange points (square symbol) to plot his result for each game. Use the green points (triangle symbol) to plot Hubert's overall average.

Note: Plot your points in the order in which you would like them connected. Line segments will connect the points automatically.

100 90 Hubert's result for each game 80 70 60 Hubert's overall average 50 FREE THROW PERCENTAGE 40 30 20 10 1 2 3 A GAME You can think of the result in any one game as being Hubert's "marginal free throw percentage." Based on your previous answer, you can deduce that when Hubert's marginal free throw percentage is above the average, the average must be