What is the Above Ground measurement in the first order of accuracy?

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Multiple Choice

What is the Above Ground measurement in the first order of accuracy?

The key idea here is the tolerance that defines how precise measurements must be for a given order of accuracy. For above-ground measurements at the first order, the standard tolerance is ±20 cm. That means a measured value should be within 20 cm of the true value. Among the options, 20 cm matches that requirement, so it’s the correct choice. The other numbers imply different levels of precision (smaller or larger tolerances) that don't align with the first-order standard.

The key idea here is the tolerance that defines how precise measurements must be for a given order of accuracy. For above-ground measurements at the first order, the standard tolerance is ±20 cm. That means a measured value should be within 20 cm of the true value. Among the options, 20 cm matches that requirement, so it’s the correct choice. The other numbers imply different levels of precision (smaller or larger tolerances) that don't align with the first-order standard.

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