Wayne measured the width of a marker tip as 0.012 cm. What is the margin of error?

The measurement 0.012 cm is given to the nearest 0.001 cm. Its margin of error is half of 0.001 cm, which is 0.0005 cm. So the width could range from 0.012 − 0.0005 = 0.0115 cm to 0.012 + 0.0005 = 0.0125 cm, matching 0.0115 to 0.0125.

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