What is the formula for calculating percent error?


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Percent Error Formula
Measured Value
Exact Value
Percent error
Percent Error = (Exact Value - Measured Value) * 100

                                           Exact Value
Example: The 1/4 mile trap speed recorded during a trial was 70.0 miles per hour (the measured value).
Later the speedo was calibrated, and it was found that the actual speed reading should have been 69.74 miles per hour (the actual value).
The percentage error in the 1/4 mile trap speed would therefore be 0.37%.
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