Basic Mathematics for College Students

27. What is the sum of the amounts of lead produced in
    1990, 2000, and 2007?


28. For which metal, lead or zinc, has the production
    remained about the same over the years?


29. In what years was the amount of zinc produced at
    least twice that of lead?


30. Find the difference in the amount of zinc
    produced in 2007 and the amount produced
    in 2000.


31. By how many metric tons did the amount
    of zinc produced increase between 1990 and
    2007?


32. Between which two years did the production of lead
    decrease?

Refer to the pictograph below to answer the following questions.

See Example 4.

33. Which group (children, parents, or seniors)
    spent the most money on ice cream at Barney’s
    Café?


34. How much money did parents spend on ice
    cream?


35. How much more money did seniors spend than
    parents?


36. How much more money did seniors spend than
    children?

Refer to the circle graph in the next column to answer the

following questions.See Example 5.

37. Of the languages in the graph, which is spoken by the
    greatest number of people?

= $100

Children

Parents

Seniors

Ice Cream Sales

at Barney’s Café

2,000,000

4,000,000

6,000,000

8,000,000

10,000,000

Metric tons

12,000,000

1990

Source: U.S. Geological Survey

2000

Year

2007

World Lead and Zinc Production

Lead

Zinc

38. Do more people speak Spanish or French?


39. Together, do more people speak English, French,
    Spanish, Russian, and German combined than
    Chinese?


40. Three pairs of languages shown in the graph are
    spoken by groups of the same size. Which pairs of
    languages are they?


41. What percent of the world’s population speak
    a language other than the eight shown in the
    graph?


42. What percent of the world’s population speak
    Russian or English?


43. To the nearest one million, how many people in the
    world speak Chinese?


44. To the nearest one million, how many people in the
    world speak Arabic?

Refer to the line graph on the next page to answer the following

questions.See Example 6.

45. How many U.S. ski resorts were in operation in 2004?


46. How many U.S. ski resorts were in operation in 2008?


47. Between which two years was there a decrease in the
    number of ski resorts in operation? (Hint:there is more
    than one answer.)


48. Between which two years was there an increase in the
    number of ski resorts in operation? (Hint:there is more
    than one answer.)

Source: The World Almanac, 2009

Spanish 5%

Estimated world population (2009): 6,771,000,000

Russian 2%

Chinese

18%

Hindi 3%

Arabic 3%

English 5%

French 1%

German 1%

World Languages

and the percents of the world

population that speak them

Other

604 Chapter 7 Graphs and Statistics