A-40 ANSWERS 13. b) Year Median Age of the U.S. Population Age 38.0 38.2 38.4 38.6 38.8 40.0 2017 2018 2019 2020 2021 2022 39. a) 0 20 40 Percent of U.S. Households with a Pet 60 80 100 70 67 2022 2019 b) Answers will vary. 41. Yes, the sum of its parts is 121%. The sum of the parts of a circle graph should be 100%. When the total percent of responses is more than 100%, a circle graph is not an appropriate graph to display the data. A bar graph is more appropriate in this situation. 43. Biased SECTION 12.2, PAGE 779 1. Frequency 3. Mark 5. Polygon 7. a) 15 b) 5 c) 12 d) 30–34 e) 35–39 9. a) 20 b) 7 c) 19 d) 16–22 e) 51–57 11. Number of Visits Number of Students 0 3 1 8 2 3 3 5 4 2 5 7 6 2 7 3 8 4 9 1 10 2 Copies Sold (millions) Number of Books 0–99 21 100–199 7 200–299 1 300–399 0 400– 499 0 500–599 1 15. Copies Sold (millions) Number of Books 50–99 21 100–149 6 150–199 1 200–249 1 250–299 0 300–349 0 350–399 0 400– 449 0 450– 499 0 500–549 1 17. Population (millions) Number of Cities 2.6–5.5 12 5.6–8.5 5 8.6–11.5 1 11.6–14.5 1 14.6–17.5 0 17.6–20.5 1 19. Population (millions) Number of Cities 2.0– 4.9 11 5.0–7.9 6 8.0–10.9 1 11.0–13.9 1 14.0–16.9 0 17.0–19.9 1 21. Cost of Living Number of States 80.0–94.9 23 95.0–109.9 13 110.0–124.9 10 125.0–139.9 2 140.0–154.9 1 155.0–169.9 0 170.0–184.9 1
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