=+1.9 A building contractor has a chance to buy an odd lot of 5000 used bricks at an auction. She is interested in determining the proportion of bricks in the lot that are cracked and therefore unusable for her current project, but she does not have enough time to inspect all 5000 bricks.

Instead, she checks 100 bricks to determine whether each is cracked. Describe the population and sample for this problem.