A measurement was 18.5 cm. Actual value 20 cm. Find the percentage error (1 dp).
\( \begin{array}{l} \text{A measurement was 18.5 cm. Actual 20 cm.} \\ \text{Percentage error (1 dp)?} \end{array} \)
Choose one option:
Round to 1 decimal place.
Use absolute difference ÷ actual × 100.
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