If a sample is found with more than 1 part requiring rework, the metal punching process is moved from "green" status to "yellow" status. If a second sample is found with more than 1 part requiring rework while the process is on "yellow" status, then it is put on "red" status and shut down for maintenance. After maintenance, the process is moved back to "green" status. After going back to "green" status, let Y be the number of hours until the next shut down ("red" status).

(d) What type of random variable is Y?

(e) On average how many hours does it take for the metal punching process to go from "green" status to "red" status?