Reporting Numbers Practice

1. True or false: The numbers from physical science experiments are always exact.

True.
False.
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2. The numbers for mass obtained from weighing an object on a balance are only as good as the smallest scale of the balance.

True.
False.
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3. In science you should always give the uncertainty in a number when you report the number.

True.
False.
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4. The average and the median are always the same number.

True.
False.
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5. The ± value is always larger than the average.

True.
False.
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6. 2.3464 ± 0.388 should be reported as:

2.346 ± 0.388
2.3464 ± 0.3880
2.3 ± 0.4
2 ± 0.388
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7. 10.973 ± 1.23 should be reported as:

10.97 ± 1.23
11 ± 1
10.9 ± 1.2
11 ± 2
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8. What would you report for the following experimental data: 2, 4, 6?

12
4
12 ± 4
4 ± 2
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9. If the following numbers were from determining the density of aluminum, what would you report for the density of aluminum: 2.9 g/mL, 2.85 g/mL, 2.5 g/mL, 2.65 g/mL?

2.725 ± .4 g/mL
10.9 ± .4 g/mL
2.7 ± .2 g/mL
3 ± 1 g/mL
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10. An object was weighed three times with the following results: 4.8 g, 5.2 g, and 5.3 g. What would you report for the mass of the object?

5.1 ± .3
5.2 ± .2
5.3 ± .5
4.8 ± .2
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