In a school, 40% of the students have brown eyes. Find the experimental probability that in a group of 4 students, at least one of them has brown eyes. The problem has been simulated by generating random numbers. The digits 0-9 were used. Let numbers "O", "1", "2", and "3" represent the 40% of students with brown eyes. A sample of 20 random numbers is shown. 7918 7910 2 546 13 90 6075 1230 2 3 86 0793 7 359 3 0 48 2816 6147 5978 5 6 2 1 9 7 3 2 9436 3 806 5971 6173 1 4 3 0
Experimental Probability = [?]% ​