Final answer:
To express the number of defective gears as a percent, divide the number of defective gears by the total number of gears produced and multiply by 100.0.6% of the gears produced are defective.
Step-by-step explanation:
To express the number of defective gears as a percent, we need to first find the ratio of defective gears to the total number of gears produced. In this case, there are 3 defective gears for every 500 produced. The ratio is 3/500.
To express this ratio as a percent, we multiply it by 100. So, (3/500) x 100 = 0.6%. Therefore, the Quality Assurance department found that 0.6% of the gears produced are defective.