1. In how many ways can five books out of eight be selected and lined up on a bookshelf so that their page counts increase from left to right?
2. What percent of the possible outcomes resulting from tossing a coin 100 times contain exactly 50 heads?
3. What percent of the possible outcomes resulting from tossing a coin 200 times contain exactly 100 heads?
4. Suppose that a sample of 20 balls is selected from an urn containing 50 white balls and 50 red balls. What percent of the possible outcomes contains 10 white balls and 10 red balls?
5. Suppose that a sample of 20 balls is selected from an urn containing 100 white balls and 100 red balls. What percent of the possible outcomes contains 10 white balls and 10 red balls?