5. Blood Testing When six job applicants are tested for use of marijuana, at least one of them tests positive.

6. Quality Control When 50 electrocardiograph units are shipped, all of them are free of defects.

7. X-Linked Disorder When 12 males are tested for a particular X-linked recessive gene, none of them are found to have the gene.

8. A Hit with the Misses When Brutus asks 12 different women for a date, at least one of them accepts.

9. Subjective Conditional Probability Use subjective probability to estimate the probability that a credit card is being used fraudulently, given that today’s charges were made in several different countries.