Need math help with the Faculty Appreciation Day

For Faculty Appreciation Day, the faculty club lunch room staff asked each faculty member to leave a business card in a container. At the end of lunch a card would be drawn, and that faculty member would be given free lunches for a week. Eighty-eight faculty left a card, including 7 mathematics faculty, 12 history faculty, and 3 chemistry faculty. Find the probability that the card drawn was for the following. (Round your answers to three decimal places.)

a) a mathematics faculty member

(b) a chemistry faculty member

(c) a history faculty member

(d) a mathematics or chemistry faculty member