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# CPR 1 - Lee The boss just assigned us a job of measuring...

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Lee, The boss just assigned us a job of measuring 100 lengths of metal rods using a ruler marked in centimeters and millimeters. Unfortunately I only had time to measure one rod before leaving for my sister’s wedding. “The number of significant figures is the number of digits believed to be correct by the person doing the measuring and includes one estimated digit.” 1 It is important to be able to determine this number so that your result is as close to correct as possible. This means that the number is not an exact one; but does it depend mostly on the precision or the accuracy since it is not exact, you ask. Well, “accuracy refers to how closely a measured value agrees with the correct value and precision refers to how closely individual measurements agree with each other.” 1 Her, you could measure with three different measuring devices and get a more accurate answer each time as the increments decreased but it
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