Finish Pre-Test Logic Problem Conversion Notes Intro to Kirk and Latoya Group Project
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• Finish Pre-Test• Logic Problem• Conversion Notes• Intro to Kirk and Latoya Group Project
Good Morning!
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Conversions Precision and Accuracy
Unit 1 Notes
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Rounding
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Systems we should know
•Metric•Standard English
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Holt McDougal Algebra1
Precision and Accuracy
Warm Up Convert each measure.
1. 3210 mm to centimeters 2. 18 in. to feet 3. 52.5 kg to grams 4. 2.5 lbs to ounces
321 cm
52,500 g
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How can you use appropriate levels of precision and
accuracy?
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Holt McDougal Algebra1
Precision and Accuracy
A. 0.8 km; 830.2 m
A tenth of a meter is smaller than a tenth of a kilometer, so 830.2 m is more precise.
Example 1: Comparing Precision of Measurements
B. 2.45 in.; 2.5 in.
Choose the more precise measurement in each pair.
0.8 km Nearest tenth of a kilometer
830.2 m Nearest tenth of a meter
2.45 in
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Holt McDougal Algebra1
Precision and Accuracy
Choose the more precise measurement in each pair.
Check It Out! Example 1
1a. 2 lb; 17 oz.
An ounce is smaller than a pound, so 17 oz is more precise.
1b. 7.85 m; 7.8 m.
2 lb17 oz
Nearest poundNearest ounce
7.85 m
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Holt McDougal Algebra1
Precision and Accuracy
A. Which scale is the most precise?
Ida works in a deli. She is testing the scales at the deli to make sure they are accurate. She uses a weight that is exactly 1 poundand gets the following results:Scale 1: 1.019 lbScale 2: 1.01 lbScale 3: 0.98 lb
Scales 2 and 3 measure to the nearest hundredth of a pound. Scale 1 measures to the nearest thousandth of a pound.
Example 2 : Comparing Precision and Accuracy
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Holt McDougal Algebra1
Precision and Accuracy
B. Which scale is the most accurate?.
Because 0.01 < 0.019 < 0.02, Scale 2 is the most accurate.
Example 2 : Continued
For each scale, find the absolute value of the difference of the standard mass and the scale reading.
Scale 1: |1.000 – 1.019| = 0.019Scale 2: |1.000 – 1.01| = 0.01 Scale 3: |1.000 – 0.98| = 0.02
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Holt McDougal Algebra1
Precision and Accuracy
Bright Days Blinds makes window shades. The width of a 30-inch shade should be within 0.18 in. of 30 in. A batch of shades has the widths shown in the table.
Example 3: Using a Specified Tolerance
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Holt McDougal Algebra1
Precision and Accuracy
Do all of the shades measure within the specified tolerance? If not, which shade(s) are not within the specified tolerance?
No, Shade B measures 29.75 in., so it is not within the specified tolerance.
Example 3 : Continued
30 – 0.18 = 29.82 30 in. ± 0.18 in. means that the shade must be
30 + 0.18 = 30.18 between 29.82 and 30.18 in.
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Holt McDougal Algebra1
Precision and Accuracy
A. 12 lb ± 3%
11.64 lb–12.36 lb
Example 4: Using Tolerance Expressed as a Percent
Write the possible range of each measurement. Round to the nearest hundredth if necessary.
12(0.03) = 0.36 Find 3% of 12.
12 lb 0.36 lb Write the measurement and tolerance.
Write the measurement as a range.
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Holt McDougal Algebra1
Precision and Accuracy
14.77 oz–15.23 oz
Example 4: Continued
B. 15 oz ± 1.5%
C. 3 m ± 0.2%
15(0.15) = 0.225 Find 1.5% of 15.
15 oz 0.23 oz Write the measurement and tolerance. Round to the nearest hundredth.
Write the measurement as a range.
3(0.002) = 0.006 Find 0.2% of 3.
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Holt McDougal Algebra1
Precision and AccuracyCheck It Out! Example 4 Continued
84.57 mg–85.43 mg
85 mg 0.43 mg Write the measurement and tolerance. Round to the nearest hundredth.
Write the measurement as a range.
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Holt McDougal Algebra1
Precision and Accuracy
1. Choose the more precise measurement: 2.4 km; 2430 m 2430 m
Lesson Quiz : part-1
2. Jorge works in a mail room. To test the accuracy of the scales in the mail room, he uses a weight that is exactly 8 oz. and gets the following results:
Scale 1: 8.02 ozScale 2: 7.8988 ozScale 3: 8.015 oz
a. Which scale is the most precise?b. Which scale is the most accurate?
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Holt McDougal Algebra1
Precision and Accuracy
3. Monique is cutting wooden slats that are to be 20 in. long. Three slats have the following lengths:
B
Lesson Quiz : Part-2
A: 19.96875 in.B: 19.875 in.C: 20.0625 in.
a. Which slat(s), if any, do not fall within a tolerance of 0.0625 in.?
b. Which slat(s), if any, do not fall within a tolerance of 0.5%? B