Exercise Make a stem-and-leaf diagram for the following set of data: {19, 25, 33, 28, 12, 41, 29, 35, 28, 37}. All slides in this chapter contain: Digital juice item #2F079_A_Abstract

Autos Sold (nearest 100,000) Year 2006 8,800,000 2007 8,400,000 2008 8,100,000 2009 7,600,000 2010 7,500,000

Automobile Sales by Year (nearest 100,000) Number Sold (in millions)

Automobile Sales by Year (nearest 100,000) Number Sold (in millions)

Making a Bar Graph or a Line Graph Draw and label the horizontal and vertical axes of the graph. Choose a scale to fit the data for each axis. Then mark the intervals along each axis.

Making a Bar Graph or a Line Graph 3. Draw a bar for each data interval, or plot points representing the data and connect them from left to right. 4. Title the graph.

Example 1 Make a bar graph of the following data for a college runner. The times, given in minutes, are his best times in the 1,500 m race for each of four consecutive years.

Year Time freshman 5:10 sophomore 4:58 junior 4:42 senior 4:37

Example 2 Make a line graph of the average price of a gallon of gasoline from 1972 through 1980. Prices are for every other year.

Average Cost per Gallon y (in $) Year x 1972 0.38 1974 0.51 1976 0.60 1978 0.67 1980 1.25

Average Cost per Gallon Cost (in dollars) Year

Example Make a bar graph for the following data.

Distances Church Members travel to Church Miles from Church Number of Members less than 2 mi. 22 2 mi. to 5 mi. 48 5 mi. to 10 mi. 39 over 10 mi. 47

Making a Pie Chart Express each quantity to be shown as a percent. Since a circle contains 360°, multiply 360 by each percent to get the number of degrees needed for each category.

Making a Pie Chart 3. Draw a circle with the desired radius, and use a protractor to measure the correct number of degrees for each category. 4. Label each pie-shaped piece in words and percents. 5. Title the graph.

Example 3 In one city in 2000 the U.S. Census Bureau found that there were about 21,000 Hispanics, 133,000 non-Hispanic whites, 20,500 blacks, and 7,500 Asians over the age of 25 with at least a high-school education. Make a pie chart of the data.

21,000 + 133,000 + 20,500 + 7,500 = 182,000 21,000 182,000 20,500 182,000 ≈ 0.11 ≈ 0.12 = 12% = 11% 133,000 182,000 7,500 182,000 ≈ 0.73 ≈ 0.04 = 73% = 4%

≈ 43° 12% x 360° = 0.12(360) ≈ 263° 73% x 360° = 0.73(360) ≈ 40° 11% x 360° = 0.11(360) ≈ 14° 4% x 360° = 0.04(360)