The IEOR advisor at ESS (Engineering Student Services) meets very few students in the earlymorning. Assume now there are 3 IEOR students in ESS, one meeting with the advisor and theother 2 are waiting in line. At the moment the student currently meeting with the advisor leaves, a 4th student comes in. LetWbe the waiting time of the 4th student until he/she starts meetingwith the advisor. Compute the PDF and CDF ofW, assuming the service times for each studentare i. i.d. with density