15. A company surveyed 250 of their employees on their age and the number of hours they exercise in a week. The results of the survey are shown in the table below. 1 2 4 2 5 Total Under 25 0 10 20 25 55 25-35 15 20 22 18 75 Over 35 45 35 26 14 120 Total 60 65 68 57 250 What is the probability that a randomly chosen surveyed person is at least 25 years old and exercises at most two hours a week? 35 (a) 250 115 (b) 250 125 (c) 250 135 (d) 250 (e) None of these