Basic Mathematics for College Students

Chapter 7 Summary and Review 625

A frequency polygonis a special line graph
formed from a histogram by joining the center
points at the top of each bar. On the horizontal
axis, we write the coordinate of the middle
value of each class interval.Then we erase the
bars.

Frequency polygon

4.5

20

40

60

80

100

120

6.5 8.5

Hours of sleep

10.5

Frequency

Refer to the table below to answer the following questions.

1. WINDCHILL TEMPERATURES
   a. Find the windchill temperature on a 10°F day
   when a 15-mph wind is blowing.
   b. Find the windchill temperature on a –15°F day
   when a 30-mph wind is blowing.


2. WIND SPEEDS
   a. The windchill temperature is F, and the
   actual outdoor temperature is 15°F. How fast is
   the wind blowing?
   b. The windchill temperature is F, and the
   actual outdoor temperature is –5°F. How fast is
   the wind blowing?

38°

25°

As of 2008, the United States had the most nuclear power plants

in operation worldwide, with 104. The following bar graph

shows the remainder of the top ten countries and the number of

nuclear power plants they have in operation.

3. How many nuclear power plants does Korea have in
   operation?


4. How many nuclear power plants does France have
   in operation?


5. Which countries have the same number of
   nuclear power plants in operation? How
   many?


6. How many more nuclear power plants in operation
   does Japan have than Canada?

France

Japan

Russian Federation

Republic of Korea

United Kingdom

Canada

Germany

India

Ukraine

010 20304050

Source: International Atomic Energy Agency

60

Number of Nuclear Power Plants in Operation

REVIEW EXERCISES

Wind

Actual temperature

speed 20°F 15°F 10°F 5°F 0°F –5°F –10°F –15°F

5 mph 16° 12° 7° 0°

10 mph 3°

15 mph

20 mph

25 mph

30 mph

35 mph 20° 27° 35° 43° 52° 58° 67° 74°

18° 25° 33° 41° 49° 56° 64° 71°

15° 22° 29° 36° 44° 51° 59° 66°

10° 17° 24° 31° 39° 46° 53° 60°

5° 11° 18° 25° 31° 38° 45° 51°

3° 9° 15° 22° 27° 34° 40°

5° 10° 15° 21°

Determining the Windchill Temperature