The names of 9 fifth-graders, including the top math and the top spelling student in the fifth-grade class, are placed in a hat and randomly selected to sit on the stage with the governor for his visit to the school. Four students are randomly selected to join the governor. What is the probability that the top math student will sit in the first chair? The probability that the top math student will sit in the first chair is . (If necessary, round to two decimal places.)