In an experiment, college students were given either four quarters or a $1 bill and they could either keep the money or spend it on gum. The results are summarized in the table. Complete parts (a) through (0) below. Purchased Gum Kept the Money '2 Students Given Four Quarters 33 18 Students Given a $1 Bill 11 28 a. Find the probability of randomly selecting a student who spent the money, given that the student was given four quarters. The probability is . (Round to three decimal places as needed.)