Suppose the average product of 6 workers is 150 units of a good and that of 7 workers is 170 units. The MP of the seventh worker equals:

Step 1: Calculate the total product for 6 workers. The average product (AP) for 6 workers is 150 units. Total Product (TP) is calculated as Average Product $\times$ Number of Workers. $TP_6 = AP_6 \times 6$ $TP_6 = 150 units/worker \times 6 \text{ workers}$ $TP_6 = 900 \text{ units}$

Step 2: Calculate the total product for 7 workers. The average product (AP) for 7 workers is 170 units. $TP_7 = AP_7 \times 7$ $TP_7 = 170 units/worker \times 7 \text{ workers}$ $TP_7 = 1190 \text{ units}$

Step 3: Calculate the marginal product (MP) of the seventh worker. The marginal product of the seventh worker is the change in total product when the seventh worker is added. $MP_7 = TP_7 - TP_6$ $MP_7 = 1190 units - 900 \text{ units}$ $MP_7 = 290 \text{ units}$

The MP of the seventh worker equals: $\boxed{290 units}$