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Audrey measured a line to be 8.7 inches long. If the actual length of the line is 8.4 inches, then what was the percent error of the measurement, to the nearest tenth of a percent?
Answer: 
%

Audrey measured a line to be 88.77 inches long. If the actual length of the line is 88.44 inches, then what was the percent error of the measurement, to the nearest tenth of a percent?\newlineAnswer: ______% \%

Full solution

Q. Audrey measured a line to be 88.77 inches long. If the actual length of the line is 88.44 inches, then what was the percent error of the measurement, to the nearest tenth of a percent?\newlineAnswer: ______% \%
  1. Understand percent error: Understand the concept of percent error. Percent error is a measure of how inaccurate a measurement is, compared to the true value. The formula for percent error is: Percent Error = (Measured ValueTrue Value/True Value)×100%(|\text{Measured Value} - \text{True Value}| / \text{True Value}) \times 100\%
  2. Identify values: Identify the measured value and the true value from the problem.\newlineThe measured value is 8.78.7 inches, and the true value is 8.48.4 inches.
  3. Calculate absolute difference: Calculate the absolute difference between the measured value and the true value.\newlineAbsolute difference = Measured ValueTrue Value|\text{Measured Value} - \text{True Value}| = 8.78.4|8.7 - 8.4| = 0.30.3 inches
  4. Calculate percent error: Calculate the percent error using the formula.\newlinePercent Error = (Absolute difference/True Value)×100%(\text{Absolute difference} / \text{True Value}) \times 100\%\newlinePercent Error = (0.3/8.4)×100%(0.3 / 8.4) \times 100\%
  5. Perform division and multiplication: Perform the division and multiplication to find the percent error.\newlinePercent Error = (0.3/8.4)×100%3.5714%(0.3 / 8.4) \times 100\% \approx 3.5714\%
  6. Round percent error: Round the percent error to the nearest tenth of a percent.\newlinePercent Error 3.6%\approx 3.6\%

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