Page 539 - Basic College Mathematics with Early Integers

516 C HAPTE R 7 I STATISTICS AND PROBABILITY

13. What was the amount of increase in wildfires from 14. What was the amount of decrease in wildfires from
2004 to 2006? 2006 to 2007?

15. What was the average annual number of wildfires 16. Give an explanation for the large increase in the
from 2006 to 2008? (Hint: How do you calculate the number of wildfires in 2006.
average?)

Objective The National Weather Service has exacting definitions for hurricanes; they are tropical storms with winds in
excess of 74 mph.The following bar graph shows the number of hurricanes, by month, that made landfall on the mainland
United States between 1851 and 2009. Use this graph to answer Exercises 17 through 22. See Example 3. (Source: National
Weather Service: National Hurricane Center)
17. In which month did the most hurricanes make Hurricanes Making Landfall in the
landfall in the United States? United States, by Month, 1851–2009

18. In which month did the fewest hurricanes make June
landfall in the United States? July
Month August
19. Approximate the number of hurricanes that made September
landfall in the United States during the month of
October
August.
November
20. Approximate the number of hurricanes that made 0 10 20 30 40 50 60 70 80 90 100 110
landfall in the United States in September. Number of Hurricanes

21. In 2008 alone, two hurricanes made landfall during 22. In 2007, only one hurricane made landfall on the
the month of August.What fraction of all the United States during the entire season, in the
76 hurricanes that made landfall during August month of September. If 107 hurricanes made landfall
is this? in the month of September between 1851 and 2009,
approximately what percent of these occurred
in 2007?

The following horizontal bar graph shows the recent population of the world’s largest cities (including their suburbs).
Use this graph to answer Exercises 23 through 28. See Example 3. (Source: CityPopulation)

23. Name the city with the largest population, and World's Largest Cities
estimate its population. (including Suburbs)

Tokyo, Japan
24. Name the city whose population is between 19 Delhi, India
million and 21 million, and estimate its population. New York, U.S.
Mexico City, Mexico
Los Angeles, U.S.
25. Name the city in the United States with the largest Seoul, South Korea
population, and estimate its population. Manila, Philippines
Mumbai, India
Sao Paolo, Brazil
26. Name the two cities that have approximately the Shanghai, China
same population.
0 4 8 12 16 20 24 28 32 36 40
Population (in millions) Copyright 2012 Pearson Education, Inc.
27. How much larger (in terms of population) is Seoul, 28. How much larger (in terms of population) is Mexico
South Korea, than São Paolo, Brazil? City, Mexico, than Shanghai, China?