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<p>is usually called the measured value, which may be optimal in some well-defined sense (e.g., a <a href="page.php?w=mean">mean</a>, <a href="page.php?w=median">median</a>, or <a href="page.php?w=Mode_%28statistics%29">mode</a>). Thus, the relative measurement uncertainty is the measurement uncertainty divided by the <a href="page.php?w=absolute_value">absolute value</a> of the measured value, when the measured value is not zero.</p>

<p><big>Background</big></p>
<p>The purpose of measurement is to provide information about a <a href="page.php?w=quantity">quantity</a></p><p>
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