Basic Mathematics for College Students

Refer to the following circle graph.

91. What percent of U.S. energy production comes from
    nuclear energy? Round to the nearest percent.


92. What percent of U.S. energy production comes from
    natural gas? Round to the nearest percent.


93. What percent of the total energy production comes
    from renewable and nuclear combined?


94. By what percent does energy produced from coal
    exceed that produced from crude oil?


95. NUMBER OF U.S. FARMS Use the data in the table
    below to make a bar graph showing the number of
    U.S. farms for selected years from 1950 through 2007.


96. SIZE OF U.S. FARMS Use the data in the table
    below to make a line graph showing the average
    acreage of U.S. farms for selected years from 1950
    through 2007.

Source: U.S. Dept. of Agriculture

97. COUPONS Each coupon value shown in the table
    below provides savings for shoppers. Make a line
    graph that relates the original price (in dollars, on the
    horizontal axis) to the sale price (in dollars, on the
    vertical axis).

Coal: 23

Renewable: 7

Nuclear: 8

Source: Energy Information Administration

Crude oil: 11

Natural gas: 22

2007 U.S. Energy Production Sources

(in quadrillion BTUs)

Total production: 71 quadrillion BTUs

98. DENTISTRY To study the effect of fluoride in
    preventing tooth decay, researchers counted the
    number of fillings in the teeth of 28 patients and
    recorded these results:
    3, 7, 11, 21, 16, 22, 18, 8, 12, 3, 7, 2, 8, 19, 12, 19, 12, 10,
    13, 10, 14, 15, 14, 14, 9, 10, 12, 13

Tally the results by completing the table. Then make a

histogram. The first bar extends from 0.5 to 5.5, the

second bar from 5.5 to 10.5, and so on.

99. What kind of presentation (table, bar graph, line
    graph, circle graph, pictograph, or histogram) is most
    appropriate for displaying each type of information?
    Explain your choices.
    
    
    • The percent of students at a college, classified by
      major
    
    
    • The percent of biology majors at a college each
      year since 1970
    
    
    • The number of hours a group of students spent
      studying for final exams
    
    
    • The ethnic populations of the ten largest cities
    
    
    • The average annual salary of corporate
      executives for ten major industries
    
    
    
    


100. Explain why a histogram is a special type of bar
     graph.


101. Write the prime numbers between 10 and 30.


102. Write the first ten composite numbers.


103. Write the even whole numbers less than 6
     that are not prime.


104. Write the odd whole numbers less
     than 20 that are not prime.

REVIEW

WRITING

608 Chapter 7 Graphs and Statistics

Number of Average size

U.S. farms of U.S. farms

Year (in millions) (acres)

1950 5.6 213

1960 4.0 297

1970 2.9 374

1980 2.4 426

1990 2.1 460

2000 2.2 436

2007 2.1 449

Coupon value:

amount saved Original price of the item

$10 $100, but less than $250

$25 $250, but less than $500

$50 $500 or more

Number of

fillings Frequency

1–5

6–10

11–15

16–20

21–25