Indicate which of the following are exact numbers. (Select all that apply.) 1. the number of microseconds in a week 2. the number of inches in a mile 3. the mass of a paper clip 4. the number of pages in a book 5. the surface area of a dime 6. the number of ounces in a pound

Question

Ray Mckinney

Chemistry

29 August, 21:17

Indicate which of the following are exact numbers. (Select all that apply.) 1. the number of microseconds in a week 2. the number of inches in a mile 3. the mass of a paper clip 4. the number of pages in a book 5. the surface area of a dime 6. the number of ounces in a pound

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Abby Murray · Answer 1

Exact numbers need not be measured. They can be counted. Conversion factors and countable units come under exact numbers. Measured quantities are measured using a device.

1) Number of microseconds in a week - Exact as it need not be measured. It can be estimated using the conversion factors between microseconds, seconds, minutes, hours, days and week.

2) Number of inches in a mile - Exact number as it is an established conversion factor.

3) The mass of a paper clip - Measured number as it has to measured using a weighing balance.

4) The number of pages in a book - Exact number as it is not measured. It can be counted.

5) Surface area of the dime-Measured number as it has to be measured.

6) The number of ounces in a pound-Exact number as it is a constant value.