Name ________________________________________ Date __________________ Class__________________
LESSON
2-3
Practice B
Precision and Accuracy
Choose the more precise measurement in each pair.
1. 2.78 L; 2782 mL
2. 6 ft; 72.3 in.
________________________
_________________________
4. 52 mm; 5.24 cm
5. 3 lb; 47 oz
________________________
_________________________
3. 2 c; 15 oz
________________________
6. 5.2 km; 5233 m
________________________
Write the possible range of each measurement. Round to the nearest
hundredth if necessary.
7. 50 m r 4%
8. 90 °F r 15%
________________________
_________________________
10. 16 ft r 1.5%
11. 9 in. r 10%
________________________
_________________________
9. 15 L r 2%
________________________
12. 66 g r 3%
________________________
Use the following information for 13 and 14.
Marcel is measuring the volume of a liquid for chemistry class. He uses a
beaker, a measuring cup, and a test tube. The teacher measures the liquid
with a graduated cylinder, which gives the most accurate reading of 26.279
milliliters (mL). Marcel’s measurements are shown below.
Measuring Device
Measurement (mL)
Beaker
26.3
Measuring Cup
25
Test Tube
26.21
13. Which device used by Marcel recorded the most precise measurement?
_________________________________________________________________________________________
14. Which device used by Marcel recorded the most accurate measurement?
_________________________________________________________________________________________
© Houghton Mifflin Harcourt Publishing Company
42
Holt McDougal Coordinate Algebra
6. The ratio of the areas is the square of the
ratio of corresponding dimensions:
§ 1 ·
¨ 20 ¸
©
¹
2
5. 49q
6. 38q
7. Possible answer:
1
.
400
8.
7. The ratio of the circumferences is equal to
the ratio of corresponding dimensions: 4.
X
10
AB
BC
XY
YZ
18
; 12 cm
15
2-3 PRECISION AND ACCURACY
Challenge
Practice A
1. ST ; YZ
2. 1 in.; 2 in.; 3.5 in.
3. DE ; XY
2
5.
4
1
2
4. 2 in.; 4 in.
3.5
0.5;
7
1
6.
or 0.5
2
1
2
0.5
1. 3215 g
2. 48 in.
3. 3.82 cm
4. 81 oz
5. 3002 mL
6. 421 cm
7. 4 qt
8. 2.9 ft
9. 25 oz
7. 0.865
10. 19.6 lb–20.4 lb
11. 28.8 cm–31.2 cm
8. a. 0.865
1
b.
or 0.5
2
12. 94.8 ft–105.2 ft
9. The sine of a 30q angle equals the cosine
of a 60q angle.
The sine of a 60q angle equals the cosine
of 30q angle.
16. C, because it is to hundredths
13. 57.3 m–62.7 m
14. 75.2°F–84.8°F
15. 17.1 L–18.9 L
17. C, because 16.05 is closest to 16
Practice B
1. 2782 mL
2. 72.3 in.
1. 1:2; 1:4
3. 15 oz
4. 5.24 cm
2. The ratio of the volumes is the cube of
the ratio of the corresponding
dimensions; 8:27
5. 47 oz
6. 5233 m
3. 720 sq. ft.
4. 4
9. 14.70 L–15.30 L
5. C
6. J
10. 15.76 ft–16.24 ft
7. B
8. G
11. 8.10 in.–9.90 in.
12. 64.02 g–67.98 g
13. test tube
14. beaker
Problem Solving
7. 48.00 m–52.00 m
8. 76.50 °F–103.50 °F
Reading Strategies
Practice C
1. 5260.0 g
2. neither
3. 420.0 mm
4. 82.1 oz
5. 4102 mL
6. 128 min
7. 65.45 m–74.55 m
8. 57.38° F–67.63° F
9. 21.38 mg–23.63 mg
1. 'ABC
2. The measure of angle B is 93 degrees.
3. Triangle XYZ is similar to triangle ABC.
10. 120 lb r 4%
11. 300 cm r 7.5%
12. 210 ft r 9.1%
13. Baseball #2
© Houghton Mifflin Harcourt Publishing Company
A6
Holt McDougal Coordinate Algebra