Answer:
marginal product of the third worker is 9.
Explanation:
Marginal product is the change in total product of labour as a result of increase labour by one unit
Marginal product = change in total product / change in labour
marginal product of third worker = (18 - 9) / (3 - 2) = 9
Total product is the sum of each individual total product = 24 + 18 + 9 = 51
Average product = total product /3 = 51 / 3 = 17