Final answer:
To find the total mass of the paper clips, multiply the average mass of one paper clip by the total number of paper clips.
Step-by-step explanation:
To find the total mass of the paper clips, we need to multiply the average mass of one paper clip by the total number of paper clips. The average mass of the paper clips is 3.9 g. The total number of paper clips is 100 (black) + 150 (white) + 250 (silver) = 500. Therefore, the total mass of the paper clips is 3.9 g/paper clip × 500 paper clips = 1950 g.