Number of Workers	Mushrooms per Day (pounds)
1	12
2	30
3	45
4	50
5	54
6	56

The table above shows the technology of production at the Matsuko's Mushroom Farm for the month of May.

1. a. What is the marginal product of the 4th worker?
2. What is the average product of labor when the farm hires 5 workers?
3. Diminishing marginal returns sets in when the ________ worker is hired.