The two-way table shows the estimated number of students who will enroll in three area high schools next year. Eleventh Tenth Twelfth Total Grade Grade Grade Mt. Woodson High School Valley High School 110 120 80 310 180 150 120 450 Riverside High School Total 160 140 200 500 450 410 400 1,260 In decimal form, to the nearest tenth, what is the probability that a randomly selected Riverside High School student is in twelfth grad O 0.2 0.3 0.4 0.5