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Percent Error Calculator
The Approximate 1/4 mile trap speed recorded during a trial was 70.0 miles per hour. Later the speedo was calibrated, and it was found that the Actual speed reading should have been 69.5 miles per hour. The Percentage Error would therefore be 0.72%.
Percent Error Formula
Approx Value

Actual Value      

References ::
Percent Error Formula
1/4 Mile Trap Speed Horsepower