The experimental probability that in a group of 4 students, at least one of them has brown eyes is 0.4, or 40%
To find the experimental probability that in a group of 4 students, at least one of them has brown eyes, we can use the given random numbers that represent the 30% of students with brown eyes. The numbers "2", "4", and "8" represent the students with brown eyes. We need to count the random numbers that contain any of these digits.
Out of the 20 random numbers provided, the following numbers contain a 2, 4, or 8:
2546
1230
2386
3048
2816
9732
9436
1430
There are 8 random numbers that contain a 2, 4, or 8. Therefore, the number of samples with 2, 4, and 8 is 8.
Now, to find the experimental probability that at least one of the 4 students has brown eyes, we can use the formula:
Experimental probability = (Number of favorable outcomes) / (Total number of outcomes)
In this case, the number of favorable outcomes is the number of samples with 2, 4, or 8, which is 8. The total number of outcomes is the total number of samples, which is 20.
Therefore, the experimental probability is:
Experimental probability = 8 / 20 = 0.4
So, the experimental probability that in a group of 4 students, at least one of them has brown eyes is 0.4, or 40%