Q. Alex measures a line to be 7.99 in long. If the actual measurement is 8 in, find Alex's relative error to the nearest thousandth.Answer:
Understand relative error: Understand the concept of relative error. Relative error is the absolute error divided by the actual measurement, often expressed as a percentage or a decimal. The absolute error is the difference between the measured value and the actual value.
Calculate absolute error: Calculate the absolute error.The absolute error is the difference between Alex's measurement and the actual measurement.Absolute error = ∣Measured Value−Actual Value∣Absolute error = ∣7.99 in−8 in∣Absolute error = ∣−0.01 in∣Absolute error = 0.01 in
Calculate relative error: Calculate the relative error.The relative error is the absolute error divided by the actual measurement.Relative error = Actual measurementAbsolute errorRelative error = 8in0.01inRelative error = 0.00125
Convert to nearest thousandth: Convert the relative error to the nearest thousandth.To express the relative error to the nearest thousandth, we round it to three decimal places.Relative error (to the nearest thousandth) = 0.001