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.
- 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. - 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.
- How many nuclear power plants does Korea have in
operation? - How many nuclear power plants does France have
in operation? - Which countries have the same number of
nuclear power plants in operation? How
many? - 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