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Greatest possible error

What is the greatest possible error for a measurement of 5 pounds?

Remember that the greatest possible error is half of the unit of measure to which a measurement is rounded. If a measurement is made to the nearest whole unit (1), the greatest possible error is 0.5.

The measurement of 5 pounds was made to the nearest whole pound.
The greatest possible error is half of 1 pound, which is 0.5 pounds.

What is the greatest possible error for a measurement of 67 feet?

The greatest possible error is feet