To calculate Trey’s percent of error, you can use the formula for percent error:
\[ \text{Percent Error} = \left( \frac{\text{Absolute Error}}{\text{Actual Value}} \right) \times 100 \]
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Calculate the Absolute Error: This is the difference between the estimated value and the actual value. \[ \text{Absolute Error} = |\text{Estimated Value} - \text{Actual Value}| = |70 \text{ feet} - 50 \text{ feet}| = 20 \text{ feet} \]
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Plug the values into the percent error formula: \[ \text{Percent Error} = \left( \frac{20 \text{ feet}}{50 \text{ feet}} \right) \times 100 \] \[ \text{Percent Error} = \left( 0.4 \right) \times 100 = 40% \]
Thus, Trey's percent of error is 40%.