Precision Worksheet

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Back to Unit 1

Part 1: MEASURING DEVICES

Record the temperature or volume of each sample to the correct number of significant figures, and include a +/- value of precision. (You will need to do this in class.)

Part 2: SIGNIFICANT FIGURES

Underline all significant figures each value, circle the uncertain figure, and count the number of sig. figs. present.

(1) 16.0 mL	(2) 10,450 g	(3) 120 miles
(4) 0.090 grams	(5) 0.05 °C	(6) 19.6060 cal

Part 3: CALCULATIONS

Perform the following calculations. Round your answers to the correct number of sig. figs., and label them with the correct units.

1. 19.400 g / 5.2 mL =
2. 15 g + 15.0 g + 15.00 g =
3. 45.7 kg - 5 kg =
4. 12 cm x 4.50 cm x 15.600 cm =
5. 120 miles / 2.35 hours =
6. 0.811 g / (62.4 mL - 60.0 mL) =

Part 4: STATISTICS

The data show the % of children who enroll in school who reach the fourth grade, in countries for which data is available for South and Central America. (1993 information Please Almanac). You will work with countries: (A-G) (M-Z) (C-H) (E-Pan)

1. What is the mean for % of children completing fourth grade?
2. What is the median for % of children?
3. What is the average deviation for % of children?
4. What is the range for % of children?

COUNTRY	PERCENTAGE	COUNTRY	PERCENTAGE
Brazil	47	Mexico	80
Chile	97	Nicaragua	51
Columbia	62	Panama	87
Costa Rica	87	Paraguay	70
Ecuador	71	Peru	81
El Salvador	57	Surinam	83
Guatemala	46	Uruguay	94
Guyana	97	Venezuela	85
Honduras	55