Final answer:
Without the total output figures for two and three workers, it is not possible to determine the marginal product of labor for the third worker accurately.
Step-by-step explanation:
The marginal product of labor (MPL) is defined as the additional output produced when one more worker is employed, assuming all other inputs are held constant. To calculate the MPL for employing a third worker, you need to know the change in total output resulting from hiring the third worker. This information, however, is not provided in the question. Therefore, without additional information about the total output produced by two workers and by three workers, it is not possible to accurately determine the marginal product of labor for the third worker. Please provide the total output figures for the different levels of labor to assist in calculating the MPL for the third worker.