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Rounding, significant figures and percentage error
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Learn it Percentage error = |approximate − exact| ÷ |exact| × 100%. Significant figures count from the first non-zero digit. An estimate is only as accurate as its least accurate measurement.
Example: A room measured as 4.5 m is really 4.38 m. Percentage error?
- |4.5 − 4.38| ÷ 4.38 × 100%
- ≈ 2.7%.
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