To evaluate the integrity of underground water lines, the department of public works randomly selects 20 sites in the city to unearth and observe the water lines. At 5 of the sites, the water lines needed repair. The department of public works concludes that about one-fourth of underground water lines throughout the city need repair.
3. To award prizes at a hockey game, four tickets with individual seat
numbers printed on them are picked from a barrel. Since Elvis's
section was not selected for any of the four prizes, he assumes that
they forgot to include the entire section in the drawing.