I used an experimental method to solve this problem, and got that the probability of 8 yuan winning was 62.5%, and the probability of 0 yuan losing was 37.5%.

The calculation is as follows: the probability of winning is higher than the probability of losing =(5-0) divided by (8-3). The total probability is equal to 1, and the error is within one ten thousandth.

I haven't figured out why this happened, but after I calculated it with a computer program, I found that the test was 100000 times, and the result was the above answer. Please solve the problem mathematically, thank you.