A manufacturing process produces a critical part of average length 100 millimeters, with a standard deviation of 3 millimeters. All parts deviating by more than 5 millimeters from the mean must be rejected. What percentage of the parts must be rejected, on average? Assume a normal distribution.

On average, approximately ____%

of the parts must be rejected.

(Type an integer or a decimal. Round to two decimal places as needed.)