The table below provides some information about students at a certain college. Find the probability that a student selected at random has the following conditions. (Round your answers to four decimal places.)
(a) The student is a senior.

(b) The student is working full time.

(c) The student is working part time, given that the student is a first-year student.

(d) The student is a first-year student, given that the student does not work.

(e) The student is a junior or senior, given that the student does not work.

(f) The student is working part time or full time, given that the student is a sophomore or a junior.