points$]$ Mount Lyon is company which provides bus transportation services to aUniversity. It received many complaints during the spring semester, and then it conducteda study of the bus system service quality. Their findings show that $10$ students arrive atthe Engineering Building stop every $2$ minutes, and $50\%$ percent of them are headed tothe students residential complex during rush hours. According to the bus schedule, thereare supposed to be one bus every $5$ minute from Engineering Building to residentialcomplex. Suppose the inter$-$arrival time between students follows exponentialdistribution, and all waiting students can be taken by a single bus.