Type the correct answer in the box. Round your answer to the nearest thousandth.
Range: 0-10, 11-20, 21-30, 31-40, 41-50
Number of Students: 8, 12, 30, 25, 15
The table shows the range of scores obtained by 9th grade students on a math test and the number of students in each range. If a student is picked at random, the probability that his or her score is between 21 and 40 is.