- HOURLY PAY The graph below shows the
average hours worked and the average weekly
earnings of U.S. production workers in
manufacturing for the years 1998 and 2008.
What did the average production worker in
manufacturing earn per hour
a. in 1998? b. in 2008?
Source:U.S. Department of Labor Statistic
- TRAVEL The illustration shows the annual number
of person-trips of 50 miles or more (one way) for the
years 2002–2007, as estimated by the Travel Industry
Association of America. Find the average number of
trips per year for this period of time.
Source:U.S. Travel Association
- OIL WELLS Geologists have mapped out the types
of soil through which engineers must drill to reach
an oil deposit. See the illustration below.
Surface
0.68 mi
0.36 mi
0.44 mi
Oil
Silt
Rock
Sand
U.S. Domestic Leisure Travel (in millions
of person-trips of 50 mi or more, one way)
2002 2003 2004
Year
2005 2006 2007
1,200
1,300
1,400
1,500
1,600
1,407.1
1,388.2
1,440.4
1,482.51,491.8
1,510.4
1998 2008
Year
$556.83
41.4 hr
41.2 hr
$710.70
500
600
700
800
400
300
200
100
039
40
41
Average weekly earnings ($)
Average
hours worked per week
U.S. Production Workers in Manufacturing
42
a. How far below the surface is the oil deposit?
4.4 Dividing Decimals 371
b. What is the average depth that must be drilled
each week if the drilling is to be a four-week
project?
- REFLEXES An online reaction time test is
shown below. When the stop light changes from
red to green, the participant is to immediately
click on the large green button. The program then
displays the participant’s reaction time in the table.
After the participant takes the test five times, the
averagereaction time is found. Determine the
average reaction time for the results shown
below.
- INDY 500 Driver Scott Dixon, of New Zealand, had
the fastest average qualifying speed for the 2008
Indianapolis 500-mile race. This earned him the pole
positionto begin the race. The speeds for each of his
four qualifying laps are shown below. What was his
average qualifying speed?
WRITING
- Explain the process used to divide two numbers
when both the divisor and the dividend are decimals.
Give an example.
- Explain why we must sometimes use rounding when
we write the answer to a division problem.
- The division is equivalent to.
Explain what equivalent means in this case.
- In , why can additional zeros be placed to the
right of 0.7 without affecting the result?
- Explain how to estimate the following quotient:
0.752.415
3 0.7
0.52.005 5 20.05
1
:2
:3
Reaction Time
(in seconds)
The stoplight
to watch.
The button
to click.
Test
Number
1
2
3
4
5
AVG.
Click
here
on
green
light
Lap 1: 226.598 mph
Lap 2: 226.505 mph
Lap 3: 226.303 mph
Lap 4: 226.058 mph
(Source: indianapolismotorspeedway.com)
0.219
0.233
0.204
0.297
0.202
?
