At a factory that produces doorknobs, 1500 doorknobs have just been produced. To check the quality of the doorknobs, a random sample of 100 doorknobs is selected to test for defects. Of these 100 doorknobs, two were found to be defective. Based on these results, what is the best estimate you can give for the number of defective doorknobs among the 1500? Solve this problem in three different ways, explaining your reasoning in each case.
