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Robert measured a line to be 2.4 inches long. If the actual length of the line is 3.2 inches, then what was the percent error of the measurement, to the nearest tenth of a percent?
Answer: 
%

Robert measured a line to be 22.44 inches long. If the actual length of the line is 33.22 inches, then what was the percent error of the measurement, to the nearest tenth of a percent?\newlineAnswer: _________% \%

Full solution

Q. Robert measured a line to be 22.44 inches long. If the actual length of the line is 33.22 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, relative 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.\newlineIn this problem, the measured value is 2.42.4 inches, and the true value is 3.23.2 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}| = 2.43.2|2.4 - 3.2| = 0.8|-0.8| = 0.80.8 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 = (0.8/3.2)×100%(0.8 / 3.2) \times 100\%
  5. Perform division and multiplication: Perform the division and multiplication to find the percent error.\newlinePercent Error = (0.8/3.2)×100%=0.25×100%=25%(0.8 / 3.2) \times 100\% = 0.25 \times 100\% = 25\%
  6. Round percent error: Round the percent error to the nearest tenth of a percent. Since the percent error is already at a whole number, rounding to the nearest tenth of a percent does not change the value.

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