To calculate the percent error, you can use the formula:
\[ \text{Percent Error} = \left( \frac{\text{Estimated Value} - \text{Actual Value}}{\text{Estimated Value}} \right) \times 100 \]
In this case, the estimated value is 60 minutes (the predicted time), and the actual value is 53 minutes (the time they actually took).
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Subtract the actual value from the estimated value: \[ 60 - 53 = 7 \text{ minutes} \]
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Divide that difference by the estimated value: \[ \frac{7}{60} \approx 0.1167 \]
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Multiply by 100 to get the percent error: \[ 0.1167 \times 100 \approx 11.67 \]
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Round to the nearest tenth: \[ \text{Percent Error} \approx 11.7% \]
So, the percent error is approximately 11.7%.