A production process operates with 0.5% nonconforming output. A sample of 50 units of product is taken randomly in every hour, and the number of nonconforming units is counted. If one or more nonconforming units are found, the process is stopped, and the quality control technician must search for the cause of nonconforming production. Evaluate the performance of this decision rule (i.e., The percentage of the samples that will stop the process to look for a cause.)