A manufacturer of an electronic voting machine uses a non destructive testing to acessthehe quality of the evms. a lot of $100$ evms is drawn periodically for testing. after testing the evm will be classified as either defective or good depending upon outcome of the test. the foloowing table gives the number of defects for $12$ such samples established the relevant control chart to acesss whether the process is under control for $3$ sigma control limits